CN104661735A - Ejector for pressure washers and pumps - Google Patents

Abstract

A pressure washer (110) comprising: a prime mover (114); a water pump (116) coupled to the prime mover, the water pump (116) including a pump inlet (128) for receiving fluid from a fluid source, and a pump outlet (130) for supplying a pressurized primary fluid; a jet pump (200) including a primary fluid inlet (205) fluidly coupled to the pump outlet (130), a secondary fluid inlet (230) configured to be coupled to a fluid source, and a fluid outlet (225); and a spray gun (118) configured to be fluidly coupled to the fluid outlet (225) of the jet pump (200), the spray gun (118) including a spray gun outlet (265) having a variable effective flow area. Wherein during operation, in a high pressure mode of operation, pressurized primary fluid flows through the jet pump (200) and out through the fluid outlet (225) of the jet pump (200); and in a high flow rate mode of operation, the pressurized primary fluid flows through the jet pump (200) and entrains a secondary fluid (230) supplied through the secondary fluid inlet resulting in a combined fluid flow.

Description

Ejectors for pressure washers and pumps

Cross references to related patent applications

This application claims the benefit of the following applications: U.S. Provisional Application No. 61/679,030, filed August 2, 2012; U.S. Provisional Application No. 61/745,461, filed December 21, 2012; U.S. Provisional Application No. 61/780,584, filed March 13, 2013; and U.S. Application No. 13/938,180, filed July 9, 2013, all of which are incorporated herein by reference in their entirety.

technical field

The present invention relates generally to pressurized and water sprayed devices such as for outdoor cleaning applications. More specifically, the present invention relates to a device configured to regulate the flow of water, for example by varying the flow rate, water pressure, shape of the stream exiting the device, or other characteristics of the stream, in order to target one of various outdoor cleaning tasks Customize the performance of your device.

Background technique

Different sprinklers are used for different applications. A garden hose sprayer can be attached to a garden hose and typically includes a nozzle that restricts the flow path of the water to adjust the flow rate and water pressure for various applications such as cleaning windows, washing cars, watering plants, etc. The water source to the garden hose sprayer is limited, which may not be sufficient for some applications.

Pressure washers typically include pumps to increase water pressure for heavy duty cleaning and resurfacing applications. Water pressure is significantly increased relative to a typical garden hose sprayer, but the flow rate may be reduced and the intensity of the spray may be too large for some applications, such as cleaning windows and watering plants.

Garden hose booster systems increase water pressure relative to a household water supply, such as for cleaning and other traditional outdoor tasks. However, the water pressure increase from boosting through a garden hose is usually less than that from a pressure washer. A need exists for water spray devices configured for a variety of outdoor cleaning applications. There is also a need to improve the "flushing" or "rinsing" capabilities of pressure washers, especially electric pressure washers (eg, to wash away debris or rinse objects being cleaned).

Contents of the invention

One embodiment of the present invention is directed to a pressure washer comprising a prime mover; a water pump coupled to the prime mover, the water pump comprising a pump inlet for receiving fluid from a fluid source, and a pump outlet for supplying pressurized primary fluid A jet pump comprising a primary fluid inlet fluidically coupled to the pump outlet, a secondary fluid inlet configured to be coupled to a fluid source, and a fluid outlet; and a spray gun configured to be fluidly coupled to the fluid outlet of the jet pump, the spray gun comprising a Spray gun outlet with variable effective flow area. wherein, during operation, a first effective flow area of the spray gun outlet creates a first back pressure at the jet pump, thereby enabling a high pressure operating mode in which pressurized primary fluid flows through the jet pump and through the jet pump out of the fluid outlet. Wherein, during operation, the second effective flow area of the spray gun outlet, which is larger than the first effective flow area, generates a second back pressure at the jet pump which is smaller than the first back pressure, thereby realizing a high flow mode of operation, in which high flow The pressurized primary fluid flows through the jet pump in the operating mode and entrains the secondary fluid supplied from the fluid source through the secondary fluid inlet so that the secondary fluid also flows through the jet pump, resulting in the primary fluid and secondary fluid flowing out through the jet pump fluid outlet. Combined fluid flow of stage fluids.

Another embodiment of the present invention is directed to an electric pressure washer comprising an electric motor; a power cord for supplying power to the electric motor; a water pump coupled to the electric motor, the water pump including a pump for receiving fluid from a fluid source inlet, and a pump outlet for supplying pressurized primary fluid; a jet pump, which includes a primary fluid inlet fluidically coupled to the pump outlet, a secondary fluid inlet configured to be coupled to a fluid source, and a fluid outlet; and a spray gun, which Configured to be fluidly coupled to the fluid outlet of the injection pump, the spray gun includes a spray gun outlet having a variable effective flow area. wherein, during operation, a first effective flow area of the spray gun outlet creates a first back pressure at the jet pump, thereby enabling a high pressure operating mode in which pressurized primary fluid flows through the jet pump and through the jet pump out of the fluid outlet. Wherein, during operation, the second effective flow area of the spray gun outlet, which is larger than the first effective flow area, generates a second back pressure at the jet pump which is smaller than the first back pressure, thereby realizing a high flow mode of operation, in which high flow The pressurized primary fluid flows through the jet pump in the operating mode and entrains the secondary fluid supplied from the fluid source through the secondary fluid inlet so that the secondary fluid also flows through the jet pump, resulting in the primary fluid and secondary fluid flowing out through the jet pump fluid outlet. Combined fluid flow of stage fluids.

Another embodiment of the present invention is directed to a pressure washer comprising a prime mover; a water pump coupled to the prime mover, the water pump comprising a pump inlet for receiving fluid from a fluid source, and a pump for supplying pressurized primary fluid an outlet; a jet pump; and a spray gun configured to be fluidly coupled to the fluid outlet of the jet pump, the spray gun including a spray gun outlet having a variable effective flow area. The jet pump includes a primary fluid inlet fluidly coupled to the pump outlet, a secondary fluid inlet configured to be coupled to a fluid source, and a fluid outlet; a mixing chamber fluidly upstream of the fluid outlet and fluidly coupled to the secondary fluid inlet; A nozzle of a flow device, wherein the nozzle is fluidly coupled between the primary fluid inlet and the fluid outlet so that the pressurized primary fluid flows through the flow restrictor before entering the mixing chamber; a bypass conduit, which is fluidly coupled to the pump outlet and a mixing chamber to provide a bypass flow path around the nozzle; and a bypass valve disposed within the bypass conduit and configured to move between an open position and a closed position to selectively open and close the bypass pipeline. wherein, during operation, a first effective flow area of the spray gun outlet creates a first back pressure at the jet pump, thereby enabling a high pressure operating mode in which pressurized primary fluid flows through the jet pump and through the jet pump out of the fluid outlet. Wherein, during operation, the second effective flow area of the spray gun outlet, which is larger than the first effective flow area, generates a second back pressure at the jet pump which is smaller than the first back pressure, thereby realizing a high flow mode of operation, in which high flow The pressurized primary fluid flows through the jet pump in the operating mode and entrains the secondary fluid supplied from the fluid source through the secondary fluid inlet so that the secondary fluid also flows through the jet pump, resulting in the primary fluid and secondary fluid flowing out through the jet pump fluid outlet. Combined fluid flow of stage fluids. wherein in the high pressure mode of operation the bypass valve is in the open position and pressurized primary fluid flows through the nozzle and the bypass flow path to the fluid outlet of the jet pump, and wherein in the high flow mode of operation the bypass The through valve is in the closed position.

Another embodiment of the present invention is directed to a water pump comprising a pumping mechanism for pressurized primary fluid flow, the pumping mechanism comprising: a pump inlet for receiving fluid from a fluid source, and a primary for supplying pressurized a pump outlet for fluid; and a jet pump including a primary fluid inlet fluidly coupled to the pump outlet, a secondary fluid inlet configured to be coupled to a fluid source, and a fluid outlet. Therein, during operation, a high-pressure operating mode is achieved at a first back pressure at the jet pump, in which pressurized primary fluid flows through the jet pump and out through a fluid outlet of the jet pump. wherein, during operation, a high flow mode of operation is achieved at a second back pressure at the jet pump that is less than the first back pressure, in which high flow mode of operation the pressurized primary fluid flows through the jet pump and entrains the flow from the fluid source through the The secondary fluid supplied by the secondary fluid inlet causes the secondary fluid to also flow through the jet pump resulting in a combined fluid flow of primary fluid and secondary fluid flowing out through the jet pump fluid outlet.

Another embodiment of the present invention is directed to a jet pump comprising a primary fluid inlet configured to be fluidly coupled to a pressurized source of primary fluid, a secondary fluid inlet configured to be fluidly coupled to a secondary fluid source, a fluid outlet, A mixing chamber fluidly upstream of the fluid outlet and fluidly coupled to the secondary fluid inlet; a nozzle having a flow restrictor, wherein the nozzle is fluidly coupled between the primary fluid inlet and the fluid outlet so that the pressurized primary fluid is flow through a flow restrictor prior to entering the mixing chamber; a bypass conduit fluidly coupled to the mixing chamber to provide a bypass flow path around the nozzle; and a bypass valve disposed within the bypass conduit and configured to Moves between open and closed positions to selectively open and close the bypass line. Wherein the bypass valve is configured to move between the open position and the closed position in response to back pressure at the injection pump. Therein, the bypass valve is in an open position at a first counterpressure at the jet pump, and the bypass valve is in a closed position at a second counterpressure at the jet pump which is lower than said first counterpressure.

Another embodiment of the present invention is directed to a jet pump kit adapted for use with a water pump that includes a jet pump including a primary pump configured to be fluidly coupled to a pump outlet of the water pump to receive pressurized primary fluid. A fluid inlet, a secondary fluid inlet configured to be fluidly coupled to the secondary fluid source for receiving the secondary fluid, and a fluid outlet, and a spray gun including a spray gun outlet having a variable effective flow area.

Another embodiment of the present invention is directed to a jet pump kit adapted for use with a water pump that includes a jet pump including a primary pump configured to be fluidly coupled to a pump outlet of the water pump to receive pressurized primary fluid. a fluid inlet, a secondary fluid inlet configured to be fluidly coupled to a secondary fluid source so as to receive a secondary fluid, and a fluid outlet, and a first spray gun including a spray gun outlet having a first effective flow area, and a second Two spray guns, the second spray gun including a spray gun outlet having a second effective flow area greater than the first effective flow area.

Another embodiment of the present invention is directed to a pressure washer comprising a prime mover; a water pump coupled to the prime mover, the water pump comprising a pump inlet for receiving fluid from a fluid source, and a pump for supplying pressurized primary fluid Outlet; Jet pump, it comprises the primary fluid inlet that is fluidly coupled to pump outlet, is configured to be coupled to the secondary fluid inlet of fluid source, and fluid outlet; First spray gun, it is configured to be fluidly coupled to the fluid outlet of jet pump, the second A spray gun having a first effective flow area; and a second spray gun configured to be fluidly coupled to the fluid outlet of the jet pump, the second spray gun having a second effective flow area greater than the first effective flow area. wherein, during operation, with the first spray gun fluidly coupled to the fluid outlet, the first effective flow area generates a first back pressure at the jet pump, thereby enabling a high pressure mode of operation in which the pressurized Primary fluid flows through the jet pump and exits through a fluid outlet of the jet pump. wherein, during operation, with the second spray gun fluidically coupled to the fluid outlet, the larger second effective flow area of the spray gun outlet generates a second back pressure at the jet pump which is less than the first back pressure, thereby achieving A high flow mode of operation in which the pressurized primary fluid flows through the jet pump and entrains the secondary fluid supplied from the fluid source through the secondary fluid inlet so that the secondary fluid also flows through the jet pump, resulting in a flow through the jet The combined fluid flow of primary fluid and secondary fluid exiting the pump fluid outlet.

Another embodiment of the present invention is directed to a method of altering flow in response to back pressure, the method comprising providing pressurized fluid to a jet pump, establishing a first back pressure at the jet pump, implementing a high pressure mode of operation in response to the first back pressure , in this high pressure mode of operation pressurized fluid flows through the jet pump at which a second back pressure is established, wherein the second back pressure is less than the first back pressure, and the high pressure is achieved in response to the second back pressure A flow mode of operation in which pressurized fluid flows through the jet pump and entrains secondary fluid to result in a combined fluid flow out of the jet pump.

Alternative exemplary embodiments relate to other features and combinations of features as may generally be recited in the claims.

Description of drawings

The present invention will be more fully understood from the following detailed description taken in conjunction with the accompanying drawings, wherein like reference numerals refer to like elements, wherein:

Figure 1 is a perspective view of a pressure washer;

Figure 2 is a schematic diagram of a flow multiplier;

3A is a schematic illustration of a portion of a pressure washer including the flow multiplier shown in FIG. 2 and operating according to a first mode of operation;

3B is a schematic illustration of a portion of a pressure washer including the flow multiplier shown in FIG. 2 and operating according to a second mode of operation;

Figure 4 is a front view of a nozzle suitable for use with the pressure washer shown in Figure 3;

Figure 5 is a front view of a second nozzle suitable for use with the pressure washer shown in Figure 3;

Figure 6 is a graph comparing flow and pressure resulting from various nozzles used with a pressure washer including a flow multiplier;

Figure 7 is a schematic diagram of an alternative flow multiplier;

Figure 8 is a schematic diagram of a portion of a pressure washer including a flow multiplier and optional chemical injection system;

9 is a cross-sectional view of the flow multiplier taken along line 9-9 of FIG. 19 in a high pressure mode of operation according to an exemplary embodiment;

Figure 10 is a detailed view of a portion of the flow multiplier shown in Figure 9;

Figure 11 is a detailed view of another portion of the flow multiplier shown in Figure 9;

Figure 12 is a cross-sectional view of the flow multiplier shown in Figure 9 in a high flow mode of operation;

Figure 13 is a detailed view of a portion of the flow multiplier shown in Figure 12;

14 is a schematic diagram of a spray gun according to an exemplary embodiment;

15 is a schematic diagram of a spray gun according to an exemplary embodiment;

16 is a schematic diagram of a spray gun according to an exemplary embodiment;

17 is a schematic illustration of a spray gun in a first configuration according to an exemplary embodiment;

Figure 18 is a schematic illustration of the spray gun shown in Figure 17 in a second configuration;

19 is a perspective view of an integrated flow multiplier and water pump assembly, according to an exemplary embodiment;

20 is a perspective view of an electric pressure washer according to an exemplary embodiment; and

21 is a perspective view of a portion of a pressure washer according to an exemplary embodiment.

Detailed ways

Before reading the accompanying drawings, which illustrate the exemplary embodiments in detail, it is to be understood that the application is not limited to the details or methodology set forth in the description or shown in the accompanying drawings. It should also be understood that the terminology is for the purpose of description only and should not be regarded as limiting.

Referring to FIG. 1 , a pressure washer 110 includes a frame 112 supporting a prime mover 114 (such as an internal combustion engine), and a water pump 116 (eg, a positive displacement pump, piston water pump, axial lobe pump). In other embodiments, an electric motor is used as prime mover 114 . In some embodiments, prime mover 114 is secured to the top of frame 112 base plate 122 , and water pump 116 is mounted below base plate 122 and is connected to the power output of prime mover 114 via a hole through base plate 122 . In other embodiments, the water pump is directly coupled to and supported by the engine or prime mover. Water pump 116 is coupled (eg, directly, indirectly through a transmission system, belts, gears, or other drive system) to prime mover 114 so as to be driven by prime mover 114 . In some embodiments, pressure washer 110 is portable and includes wheels 124 and a handle 126 . In other embodiments, pressure washer 110 may be stationary. In other embodiments, pressure washer 110 is mounted to a trailer or other vehicle. Water pump 116 includes a pump inlet 128 and a pump outlet 130 . The pump inlet 128 is configured to couple to a supply pipe or hose, which in turn connects to a fluid supply (eg, to a municipal water supply or the casing of a well). In some embodiments, pump inlet 128 includes a low pressure garden hose coupling for coupling a garden hose to pump inlet 128 . The pump outlet 130 includes a high pressure fitting (eg, an M22 fitting) for coupling the pump outlet 130 to the delivery conduit 120 or other means including a suitable high pressure fitting. As shown in FIG. 1 , pressure washer 110 utilizes a vertical axis motor. According to an alternative embodiment, the prime mover may be a horizontal shaft engine.

Referring to FIG. 2 , a flow multiplier, flow inducer, entrainment device, injector, eductor, or jet pump 200 is shown. The function of the flow multiplier 200 is to provide the pressure washer 110 with at least two modes of operation: a high pressure mode and a high flow mode. "Flow" means volumetric flow rate and is usually measured in gallons per minute ("gpm"). The flow multiplier 200 includes a primary fluid inlet 205 fluidly connected to the pump outlet 130, a restricted or constricted section 210 downstream of the primary fluid inlet 205, a primary fluid nozzle 215 downstream of the constricted section 210, a mixing chamber having a fluid outlet 225 Chamber 220, and a secondary fluid inlet 230 in fluid communication with mixing chamber 220. The primary fluid inlet 205 may be coupled directly to the pump outlet 130 or remotely coupled to the pump outlet 130 (eg, via high pressure tubing or hose).

Referring to FIGS. 3A-3B , primary fluid inlet 205 is configured to couple to pump outlet 130 (eg, through a high pressure fitting) and allow primary fluid to enter flow multiplier 200 . Alternatively, primary fluid inlet 205 may be coupled to the high pressure side of water pump 116 but still within the housing of water pump 116 . For example, the fluid inlet 205 may be inline with the pumping mechanism (e.g., one or more pump pistons), the flow of fluid from the pumping mechanism to the pump outlet 130 of the pumping mechanism, or a pump manifold and be inline with the pumping mechanism. mechanism, pump outlet 130, or downstream of the pump manifold. The flow multiplier 200 can be located upstream or downstream of the unloading valve, which is located in the water pump 116 . The unload valve allows fluid to recirculate from the high pressure side of the pump 116 to the low pressure side when fluid flow from the pump outlet 130 ceases (eg, when flow from the spray gun 118 ceases). Narrowed section 210 connects primary fluid inlet 205 and nozzle 215 . The diameter of the narrowed section 210 decreases in the direction of fluid flow from the primary fluid inlet 205 to the nozzle 215 . Nozzle 215 extends into mixing chamber 220 and includes a nozzle outlet 235 within mixing chamber 220 .

Secondary fluid inlet 230 allows secondary fluid to enter mixing chamber 220 . The secondary fluid inlet 230 is fluidly coupled to a fluid supply. In a preferred embodiment, the secondary fluid inlet 230 and the pump inlet 128 share a common fluid supply (eg, a garden hose sleeve or inlet hose). In some embodiments, secondary fluid inlet 230 comprises a low pressure garden hose fitting. In other embodiments, the inlet 230 originates from a tee fitting 255 disposed upstream of the pump that splits or splits flow from a water source (eg, a casing connected to a municipal water system or a well) into two streams. A first substream is provided to pump inlet 128 and a second substream is provided to secondary fluid inlet 230 . In certain modes of operation, the secondary fluid flows through the secondary inlet 230 into the mixing chamber 220, and within the mixing chamber 220, the secondary fluid entrains the primary fluid that exits the nozzle 215 at the outlet 235, resulting in a flow through the fluid outlet 225 the combined fluid stream exiting the flow multiplier 200 . In some embodiments, fluid outlet 225 includes a high pressure fitting.

Referring to FIGS. 3A and 3B , a portion of a pressure washer 110 including a flow multiplier 200 is shown. Primary fluid inlet 205 is fluidly coupled to pump outlet 130 . According to an exemplary embodiment, pump outlet 130 provides water pressurized to 3000 pounds per square inch ("psi") and at a flow rate of 2.5 gpm. Conventional high pressure water pumps used in multipurpose pressure washers, such as the Annovi Reverberi RMW series pumps, can be used. Supply conduit 240 (eg, a low pressure hose) is fluidly coupled to pump inlet 128 and fluid supply 245 . In some embodiments, fluid supply 245 is a municipal water system or a well. A secondary fluid conduit 250 (eg, a lower pressure hose) is fluidly coupled to secondary fluid inlet 230 . Secondary fluid conduit 250 is fluidly coupled to supply conduit 240 by tee fitting 255 to fluidly connect secondary fluid conduit 250 to fluid supply 245 . In some embodiments, tee fitting 255 is positioned at pump inlet 128 . In other embodiments, a tee or Y-joint is provided at the fluid supply, where one outlet of the joint is fluidly coupled to the supply conduit 240 and the other outlet of the joint is fluidly coupled to the secondary fluid conduit 250 . In some embodiments, tee fitting 255 includes a check valve to prevent fluid flow toward the fluid source. A check valve 260 is positioned along the secondary fluid conduit 250 to prevent backflow, that is, to prevent fluid flow from the mixing chamber 220 towards the fluid supply 245 . For back pressure above the threshold pressure at flow multiplier 200 , check valve 260 is closed and a relatively high pressure low flow fluid flow will be provided from spray gun 118 . For back pressures below the threshold pressure at the flow multiplier 200 , the check valve 260 opens, providing a relatively low pressure high flow fluid flow from the spray gun 118 . Delivery conduit 120 (eg, a high pressure hose) is fluidly coupled to fluid outlet 225 . Spray gun 118 is fluidly coupled to an opposite end of delivery conduit 120 .

Referring to FIGS. 3A-5 , spray gun 118 includes at least two modifiable, changeable, or interchangeable nozzles 265 and 270 . As shown in FIG. 4, the first nozzle 265 has a low flow fluid flow suitable for generating a relatively high pressure (e.g., 3000 psi at 2.5 gpm for an air pressure washer, 1.3 gpm for an electric pressure washer). The first effective flow area 275 (eg, diameter or cross-sectional area) of 1700 psi). As shown in FIG. 5, the second nozzle 270 has a second effective flow area 280 (e.g., diameter or cross-sectional area) that is greater than the first flow area 275 and is adapted to generate a relatively low pressure high flow fluid flow (e.g., 450 psi at 5.0 gpm for pneumatic pressure washers, 150 psi at 4.5 gpm for electric pressure washers). The high-pressure, low-volume fluid stream generated by the first nozzle 265 may be atomized immediately or shortly after the fluid stream exits the first nozzle 265 . The high pressure, low flow fluid stream is suitable for pressure washing applications like removing debris, dust, dirt, mildew, etc. from decks, yards, fences or other surfaces or structures. The low-pressure, high-volume fluid stream produced by the second nozzle 270 substantially maintains its shape for a substantial distance from the second nozzle 270 . The low pressure, high flow fluid stream is a coherent or concentrated stream that can travel a substantial distance from the spray gun 118 . In some embodiments, the second nozzle 270 includes flow conditioning elements (eg, parallel flow conduits through which fluid flows) to improve flow continuity. Such flow conditioning elements are described in US Patent Application No. 12/429,028, filed April 23, 2009 and published as US 2010/0270402, which is hereby incorporated by reference in its entirety. High flow fluid flow at low pressure is suitable for flushing or low pressure cleaning at a distance. For example, a high flow fluid stream at low pressure can be used to clean second floor windows, flush honeycomb from trees or eaves, or with a suitable gutter cleaning attachment, clean gutters while the user is still standing on the ground. A trigger on the spray gun 118 is used to stop and start fluid flow through the spray gun 118 .

In some embodiments, the at least two nozzles 265 and 270 are different settings of the spray gun 118 and can be selected by the user by twisting, clicking, or otherwise moving between positions (eg, rotary nozzles). In other embodiments, a separate nozzle 265 or 270 is selected and attached to the spray gun by a fitting (eg, a quick connect fitting). In other embodiments, each nozzle is part of a unique spray gun such that a first spray gun includes nozzle 265 and a second spray gun includes nozzle 270 . In other embodiments, individual nozzles (e.g., variable nozzles) can be adjusted (e.g., by twisting, clicking, or otherwise moving) to adjust the size of the effective flow area of the individual nozzles to provide an equivalent of Various arrangements of the at least two nozzles 265 and 270 described above.

In use, the water pump 116 pumps primary fluid received through the pump inlet 128 and outputs the primary fluid at increased pressure through the pump outlet 130, whereby, due to the restriction that exists downstream of the pump outlet 130 (for example, by the currently used Restrictions formed by nozzles and/or other downstream components) to form a pressurized primary fluid. In some embodiments, water pump 116 is capable of developing pressures of up to 500 pounds per square inch ("psi"), or in other embodiments, 5000 pounds per square inch ("psi") or more. In some embodiments, water pump 116 is capable of developing a pressure in the range of 1000-5000 psi, preferably 1500-4000 psi. In some embodiments, water pump 116 is capable of developing a pressure of 100 psi or greater.

As shown in FIG. 3B , for the high flow mode of operation, a high flow or second nozzle 270 is selected at the spray gun 118 . Water pump 116 provides pressurized primary fluid to flow multiplier 200 . Primary fluid enters the flow multiplier at inlet 205 and is restricted by constriction 210 and nozzle 215 . The primary fluid continues through nozzle 215 and exits outlet 235 into mixing chamber 220 . The flow of the primary fluid through the mixing chamber 220 creates a vacuum or region of low pressure within the mixing chamber (eg, via the Bernoulli or Venturi effect, or a combination of both). The pressure differential between the low pressure zone and the secondary fluid and/or vacuum or low pressure zone in secondary fluid conduit 250 is sufficient to open check valve 260 and introduce the secondary fluid into mixing chamber 220 through secondary fluid inlet 230 Inside. Once inside the mixing chamber 220, the secondary fluid is entrained by the primary fluid, thereby significantly increasing the volume of flow compared to its own primary fluid. The combined fluid stream exits mixing chamber 220 through fluid outlet 225 and travels through delivery conduit 120 to spray gun 118 . The combined fluid stream exits the spray gun 118 through the second nozzle 270 as a low pressure high flow fluid stream (compared to the high pressure operation described below). In some embodiments, the effective flow area of the primary fluid nozzle 215 is less than the effective flow area 280 of the high flow nozzle 270 .

As shown in FIG. 3A , for the high pressure mode of operation, a high pressure or first nozzle 265 is selected at the spray gun 118 . The relatively small first flow area 275 restricts fluid flow through the first nozzle 265 and creates back pressure within the jet pump 200 (eg, in the mixing chamber 220 ). This back pressure controls or overcomes the low pressure zone that would otherwise be formed by the high pressure primary fluid flowing away from the nozzle 215 and keeps the secondary fluid from entering the mixing chamber 220 . Check valve 260 will also be closed in the high pressure mode of operation. Primary fluid exits mixing chamber 220 through fluid outlet 225 and travels through delivery conduit 120 to the spray gun. The primary fluid exits the spray gun 118 through the first nozzle 265 as a higher pressure low flow fluid stream (compared to the high flow operation described above). In some embodiments, the effective flow area (eg, diameter or cross-sectional area) of the primary fluid nozzle 215 is greater than the effective flow area 275 of the high pressure nozzle 265 .

The mode of operation is selected by changing the nozzle of the spray gun 118 and thereby changing the back pressure at the flow multiplier 200 (eg, within the mixing chamber 220 ). Users are able to quickly and easily change between high flow and high pressure operating modes by simply switching between the appropriate nozzles. There is no need to adjust switches, dials or other interfaces at the body of the pressure washer. Multiple high pressure operating modes and multiple high flow operating modes are possible, with each operating mode associated with a different nozzle having a different effective flow area.

Referring to Fig. 6, for four different low-pressure high-flow nozzles (285, 290, 295, 300), high-pressure low-flow nozzles, and no nozzles, the applicant conducted tests to control the pressure from the flow multiplier. The fluid pressure and flow output of the washer gun are compared. To test the effect of the flow multiplier, a test system was developed that allowed the fluid leaving the pump to flow through the flow multiplier or bypass the flow multiplier. Flow rate and water pressure measurements are made downstream of the flow multiplier. With no nozzles, no pump running, and the flow multiplier bypassed (such that no fluid flows through the flow multiplier), the fluid output was 0.57 gpm. With no nozzles, no pump running but with a flow multiplier, the fluid output is 2.45gpm. With no nozzles, pump running and flow multiplier bypassed, the fluid output was 2.8gpm. Fluid output was 5.6 gpm at 120 psi with no nozzle (data point 305), water pump running, and flow multiplier used. Adding a flow multiplier doubled the flow rate from 2.8gpm to 5.6gpm with no nozzle and the pump running. Fluid output was 4.7 gpm at 170 psi with nozzle 285, water pump running, and using a flow multiplier. Fluid output was 4.1 gpm at 185 psi with the nozzle 290 pump running and using the flow multiplier. Fluid output was 3.8 gpm at 188 psi with nozzle 295, water pump running, and using a flow multiplier. With nozzle 300, water pump running, and using a flow multiplier, the fluid output is 3.35 gpm at 190 psi. Fluid output was 2.5 gpm at 2500 psi with conventional high pressure nozzles, water pump running and flow multiplier bypassed (eg, test system operated as a conventional pressure washer). Figure 6 shows the results of testing by the applicant on a pressure washer 110 including a flow multiplier 200 for four different low pressure high flow nozzles (285, 290, 295, 300) and no nozzle (305). A graph of flow (in gpm) versus pressure (psi). Theoretically, the flow multiplier 200 provides a fluid output that is infinitely variable between a minimum flow mode at maximum pressure and a maximum flow mode at minimum pressure, as controlled by changing the flow area of the spray gun nozzle, where the maximum pressure and flow are determined by the prime mover 114 and pump 116 selected for use in the pressure washer 110 .

Flow multiplier 200 may be included as part of pressure washer 110, included as part of water pump 116, included as part of a flow multiplier kit that allows a user to retrofit a pressure washer, incorporated into spray gun 118, or Commercialize in other suitable ways. In some embodiments, a flow multiplier kit includes a flow multiplier 200 and a spray gun 118 . The spray gun outlet has a variable effective flow area (for example, multiple nozzles can be inserted into the spray gun 118, the turret includes multiple nozzles, a single nozzle with a variable effective flow area), or the kit includes multiple spray guns, where each Each gun has a different effective flow area to allow the user to choose between high pressure and high flow modes of operation. The kit may also include high flow hose or tubing 120 . The delivery line 120 included in many conventional pressure washers is a quarter inch high pressure hose. To properly accommodate the increased flow provided by the flow multiplier, a high flow pressure hose or delivery line 120 (eg, a three-eighth inch high pressure hose) is preferred. In some embodiments, a quarter inch high pressure hose is used as the delivery conduit 120 . In some embodiments, a kit may include two hoses or tubing (ie, a high flow tubing and a high pressure tubing).

In some embodiments, jet pumps are used as flow multipliers. One type of jet pump is shown in FIG. 2 . Another type of jet pump 315 is shown in FIG. 7 . Components of jet pump 315 that are similar to those shown above and in FIG. 2 are identified with the same reference numerals. Jet pump 315 also includes a converging cone 320 downstream of secondary fluid inlet 230 . Converging cones 320 define the entrainment zone. The mixing chamber 220 includes a constant diameter mixing zone 325 and a diverging cone 330 through which the fluid flows before reaching the fluid outlet 225 .

As recognized by those skilled in the art, jet pumps are best used as flow multipliers. However, a venturi can be used as a flow multiplier. One advantage of jet pumps is that they include fewer moving parts than commercially available variable flow rate fluid pumps (e.g., mechanical fluid pumps that provide variable displacement or otherwise vary the fluid flow rate), and are available in In some embodiments, there are no moving parts. Another advantage of the jet pump is that it uses a relatively small volume of primary fluid in order to entrain a relatively large volume of secondary fluid, resulting in a relatively large volume of combined fluid consisting primarily of secondary fluid. Venturi tubes use a relatively large volume of primary fluid in order to entrain a relatively small volume of secondary fluid, resulting in a relatively large volume of combined fluid consisting primarily of primary fluid. For example, a venturi in a carburetor uses a relatively large volume of air to entrain a relatively small volume of fuel to form an air-fuel mixture that is primarily air. In some embodiments, a vane-driven pump (eg, a turbocharger) is used as a flow multiplier. Vanes or impellers are positioned within the pressurized fluid flow and are used to drive the pump for supplying the secondary fluid. The turbocharger may be selectively actuated by user input (e.g., a switch) or in response to a pressure differential somewhere in the pressure washer system (e.g., in response to a change in pressure caused by a change in the effective flow area of the spray gun nozzle) ; otherwise, the turbocharger can simply idle and provide no additional flow. Optionally, the turbocharger is positioned within a bypass flow path through which pressurized fluid flow does not flow when additional flow is not required. When the turbocharger is activated (eg, as described above), the valve directs at least a portion of the pressurized fluid flow through the bypass flow path and to the turbocharger to provide additional flow. In some embodiments, all pressurized fluid flow is directed through the bypass flow path when the turbocharger is activated. In other embodiments, a portion of the pressurized fluid flow is directed through the bypass flow path when the turbocharger is activated. In other embodiments, a flow multiplier is a structure that uses the kinetic energy of a first fluid flow to entrain or pump a second fluid flow.

Flow multiplier 200 allows pressure washer 110 to provide high volume or "boosted" flow without having to make mechanical changes to water pump 116 . Typically, to increase flow from the water pump 116, it will be necessary to make mechanical changes to the pump, such as by increasing the piston stroke, changing the pump displacement, or operating the pump at a higher speed. To this end, operating the water pump 116 at a different flow requires changing the ability to mechanically alter the water pump 116, for example, mechanically altering the piston stroke, mechanically altering the displacement, or operating the pump at a different speed. The flow multiplier 200 eliminates the mechanical complexity that would otherwise be required by using the pressurized fluid output from the water pump 116 to respond to back pressure from the spray gun 118 to create a varying fluid flow output from the flow multiplier 200 at different flow outputs. The water pump 116 of the pressure washer 110 is operated. A single flow water pump (eg, water pump 116 ) and flow multiplier 200 may provide cost savings compared to other variable flow pumps (eg, variable displacement, variable stroke, variable speed, etc.). The back pressure from the spray gun 118 can be easily varied by changing the effective flow area of the spray gun outlet. This allows the user to easily change between high flow and high pressure modes of operation by simply changing the effective flow area of the spray gun outlet (eg, by changing the nozzle, adjusting the adjustable nozzle, or changing the spray gun). Optionally, a user-adjustable flow restrictor (e.g., valve, dial, etc.) can be placed downstream of the flow multiplier 200 to vary the back pressure at the flow Change between pressure operating modes.

Referring to FIG. 8 , a portion of a pressure washer 110 including a flow multiplier 200 is shown. FIG. 8 shows two optional chemical injection systems 335 and 340 and an optional differential pressure activated bypass 345 around flow multiplier 200 .

Optional chemical system 335 includes reservoir 350 fluidly coupled to secondary fluid conduit 250 via conduit 355 and valve 360 . Reservoir 350 includes chemicals such as soaps, detergents, spot rinses, herbicides, polishes, and the like. Valve 360 is a two position diverter valve that allows the user to select a "chemical" mode and an "off" mode where chemical flow is allowed through valve 360 to secondary fluid inlet 230 and secondary fluid flow is stopped Through valve 360 , while in the “closed” mode, secondary fluid is allowed to flow through valve 360 and chemical flow through valve 360 is stopped. Optionally, in embodiments including a three-position valve, the secondary fluid is allowed to mix with the chemical flow in chemical mode or "mix mode". A flow restrictor 365 (eg, a metering orifice) is positioned along conduit 355 between reservoir 350 and valve 360 . Flow restrictor 365 restricts the flow of chemicals from reservoir 350 . In use, using the nozzle 270 in the high flow mode of operation and the valve 360 in the chemical mode, a pressure differential between the low pressure zone in the mixing chamber 220 and the reservoir 350 causes the chemical to flow from the reservoir 350 to Secondary fluid conduit 250 . The chemical flow is entrained by the primary fluid into the mixing chamber 220 , thereby providing a combined fluid flow including the primary fluid and chemical to the spray gun 118 . In some embodiments, a check valve is positioned within conduit 355 to prevent secondary fluid from flowing into reservoir 350 .

Optional chemical system 340 includes reservoir 370 fluidly coupled to secondary fluid conduit 250 via conduit 375 and venturi 380 . Reservoir 370 contains chemicals to be added to the secondary fluid. On/off valve 385 is positioned between reservoir 370 and venturi 380 along conduit 375 and is movable between an "on" position in which conduit 375 is open, while in the "closed" position, conduit 375 is closed. Optionally, valve 385 is variable to allow a user to meter the flow of chemicals from reservoir 370 . A check valve 390 is positioned along conduit 375 between on/off valve 385 and venturi 380 to prevent back flow from venturi 380 toward reservoir 370 . In use, in the high flow mode of operation with the on/off valve 385 in the open position, the flow of secondary fluid through the venturi tube 380 creates a venturi effect which draws the chemical through the conduit 375 so that the chemical The product mixes with the secondary fluid stream. This mixed flow of secondary fluid and chemical is then entrained by the primary fluid flow into mixing chamber 220 , thereby providing a combined fluid flow comprising primary fluid, secondary fluid, and chemical to spray gun 118 . In some embodiments, chemical systems 335 and 340 include one or more additional reservoirs that include different chemicals than the first reservoir. A user can select between the reservoirs by actuating a selector valve that fluidly couples one of the reservoirs to an appropriate supply conduit.

If the optional differential pressure actuated bypass 345 would be necessary in the high pressure mode of operation, the flow multiplier 200 would subject the pressurized primary fluid flow to unacceptable energy losses, and the output pressure from the spray gun 118 would be unacceptable. loss. If this is true, differential pressure actuated bypass 345 allows a portion of the pressurized primary fluid flow to bypass flow multiplier 200 in the high pressure mode of operation. Differential pressure-actuated bypass 345 includes conduit 395 in fluid communication with water pump 116 and delivery conduit 120 to partially bypass flow multiplier 200 and differential pressure-actuated valve 400 (eg, needle and seat valves). The piston in valve 400 is normally in the open position. In use, in the high flow mode of operation, a relatively large pressure differential is created across valve 400, i.e., a relatively low pressure combined fluid flow at the outlet of bypass conduit 395 and a relatively high pressure at the inlet of bypass conduit 395. High pressure primary fluid flow, which causes the 400 valve to close. In use, in the high pressure mode of operation, the pressure differential across valve 400 is relatively low (i.e., relatively high pressure primary fluid flow at the inlet and outlet of bypass conduit 395) and is spring controlled, causing valve 400 to Open, allowing pressurized primary fluid flow to bypass flow multiplier 200 through conduit 395 . In use, in the high flow mode of operation, valve 400 is closed.

Referring to Figures 9-13, a flow multiplier or jet pump 500 is shown. Many features and uses of jet pump 500 are similar to those described above for flow multiplier 200 . Jet pump 500 includes main body 502, primary fluid inlet 505, primary fluid nozzle 510 including primary fluid restrictor 515 downstream of primary fluid inlet 505, mixing chamber 520, fluid outlet 525 downstream of mixing chamber, and fluid coupling Secondary fluid inlet 530 to mixing chamber 520 . Primary fluid inlet 505 leads to primary fluid chamber 535 located upstream of primary fluid nozzle 510 . Outlet conduit 540 is located between mixing chamber 520 and fluid outlet 525 . The outlet conduit 540 defines an outlet channel 542 that includes a step 545 where the diameter of the outlet channel 542 increases. An annular chamber 550 is formed between the outer surface of outlet conduit 540 and a portion of body 502 . Bypass conduit 555 fluidly couples primary fluid inlet 505 to a location downstream of primary fluid nozzle 510 . As shown, bypass conduit 555 fluidly couples primary fluid chamber 535 to annular chamber 550 . A bypass valve 560 is provided in the bypass pipe 555 to selectively open and close the bypass pipe 555 . The chemical inlet 565 is located downstream of the mixing chamber 520 .

Jet pump 500 is configured to operate in two different modes (high pressure mode and high flow rate) in response to back pressure at jet pump 500 (e.g., back pressure at fluid outlet 525, mixing chamber 520, primary fluid nozzle 510). Mode) one of the operations. High pressure mode is achieved when the back pressure is above a threshold pressure or pressure range. High flow mode is achieved when the back pressure is below a threshold pressure or pressure range. The back pressure at the jet pump 500 is created by restricting the flow downstream of the jet pump 500 . For example, as will be discussed in more detail below, the back pressure at jet pump 500 can be controlled by varying the effective flow area of the pressure washer gun. A spray gun comprising a nozzle with a relatively small effective flow area will create a relatively high back pressure at the jet pump 500, enabling a high pressure mode of operation, and a spray gun comprising a nozzle with a relatively large effective flow area will create a relatively high back pressure at the jet pump 500. A relatively low back pressure is created at 500, allowing for a high flow mode of operation.

Primary fluid inlet 505 is configured to be coupled to a source of pressurized primary fluid (eg, pump outlet 130 ). In some embodiments, primary fluid inlet 505 is configured to couple directly to pump outlet 130 . In other embodiments, primary fluid inlet 505 and/or jet pump 500 are integrally formed with water pump 116 (eg, as a single integral component). In other embodiments, the primary fluid inlet 505 is configured to be indirectly coupled to the pump outlet 130 (eg, through a high pressure hose or pipe). The secondary fluid inlet 530 is configured to be fluidly coupled to a fluid source (eg, a municipal water system or a well). In some embodiments, the secondary fluid inlet 530 is configured to be fluidly coupled to a fluid source via a low pressure hose or conduit (eg, a garden hose connected to a bushing). In a preferred embodiment, the primary fluid and the secondary fluid are drawn from the same source. For example, the pump inlet 128 of the pressure washer 110 and the secondary fluid inlet 530 of the jet pump 500 are connected to the same conduit (eg, via a garden hose and tee 815). Secondary fluid inlet 530 provides secondary fluid to mixing chamber 520 .

As shown in FIG. 9 , in the high pressure mode of operation, pressurized primary fluid enters jet pump 500 via primary fluid inlet 505 . A first stream or flow of pressurized primary fluid (shown by the arrows in FIG. 9 ) flows through primary fluid chamber 535 and through primary fluid nozzle 510 . A second stream or flow of pressurized primary fluid (shown by the arrows in FIG. 9 ) flows through primary fluid chamber 535, through bypass conduit 555, to a location downstream of primary fluid nozzle 510 (e.g., opening 600), where The second flow or flow at the location recombines with the first flow of pressurized primary fluid to form a recombined high pressure fluid flow or flow of pressurized primary fluid exiting jet pump 500 through fluid outlet 525 (indicated by the arrows in FIG. 9 ). Show). As shown, the first stream of pressurized primary fluid exits the primary fluid nozzle 510 to the mixing chamber 520, and flows from the mixing chamber 520 through the outlet passage 542 where the first stream of pressurized primary fluid is combined with the pressurized The second stream of primary fluid recombines into a recombined high-pressure fluid stream of pressurized primary fluid. The second flow of pressurized primary fluid flows through bypass conduit 555 to annular chamber 550 and then through one or more passages or openings 600 fluidly coupling annular chamber 550 to outlet passage 542, where The second flow of pressurized primary fluid at each channel or opening recombines with the first flow of pressurized primary fluid into a recombined flow of pressurized primary fluid.

In the high pressure mode of operation, the back pressure at the jet pump 500 (eg, at the mixing chamber 520 ) caused by components downstream of the jet pump 500 (eg, spray gun, spray gun nozzle, etc.) controls or overcomes the mixing chamber 520 A low pressure zone within the nozzle 510 that would otherwise be formed by the high pressure primary fluid flow exiting the nozzle 510 prevents the secondary fluid from entering the mixing chamber 520 . In the high pressure mode of operation, the check valve 557 at or upstream of the secondary fluid inlet 530 is closed. In some embodiments, in the high pressure mode of operation, a small amount of secondary fluid may enter the mixing chamber 520 .

Bypass line 555 ensures that jet pump 500 provides an acceptable flow of pressurized fluid in the high pressure mode of operation. Without bypass line 555, all of the pressurized primary fluid would flow through restrictor 515, which in some embodiments could cause unacceptable pressure in the pressurized fluid stream delivered from jet pump 500. drop. Bypass valve 560 moves between an open position (FIGS. 9 and 10) and a closed position (FIGS. 12 and 13) so that the bypass valve A pressure differential at 560 , and/or a biasing force (eg, from spring 575 ) selectively opens and closes bypass conduit 555 . As shown in FIGS. 9 and 10 , in the high pressure mode of operation, the pressure differential across bypass valve 560 and/or the force exerted by spring 575 causes the valve to move to the open position, thereby allowing pressurized primary fluid to flow through the bypass valve. Through pipe 555 . As shown in FIGS. 12 and 13 , in the high flow mode of operation, the fluid force exerted by the pressurized primary fluid on the surface of the piston 567 and/or the pressure differential across the bypass valve 560 causes the valve to move to the closed position, thereby Pressurized primary fluid is prevented from flowing through bypass conduit 555 . In the high pressure mode of operation, the pressure differential across bypass valve 560 is below a threshold differential pressure (e.g., the differential pressure between the pressurized primary fluid flow at primary fluid chamber 535 and the pressurized primary fluid flow at outlet passage 542 relatively small), and in the high flow mode of operation, the pressure differential across bypass valve 560 is above the threshold pressure (e.g., the pressure differential between the pressurized primary fluid flow at primary fluid chamber 535 and the pressure differential at outlet passage 542 relatively high between combined fluid streams).

Bypass valve 560 includes a movable piston 567 , a valve seat or pivot 570 , and a spring or biasing member 575 . The piston 567 includes an opening 580 on the upstream side of the piston 567 and a chamber 585 on the downstream side of the piston 567 . In some embodiments, opening 580 has a smaller diameter than chamber 585 . Chamber 585 is sized and shaped to receive valve seat 570 such that valve seat 570 contacts or engages one or more surfaces defining chamber 585 to prevent fluid flow therethrough with piston 567 in the closed position. Piston 567, thereby closing bypass valve 560. When in the open position, piston 567 moves away from valve seat 570 such that bypass valve 560 is open and fluid can flow through piston 567 via opening 580 and chamber 484 . Opening 580 is sized to set the threshold pressure differential at which bypass valve 560 changes position and to provide sufficient fluid flow through open bypass valve 560 to ensure that jet pump 500 provides Acceptable flow of pressurized fluid. Spring 575 biases piston 567 to the open position.

In some embodiments, bypass conduit 555 has a smaller diameter upstream of bypass valve 560 than the diameter at bypass valve 560 . This change in diameter forms a shoulder or seat against which the piston 567 is held in the open position. The shoulder also reduces the amount of fluid surface area available to the piston 567 surface when the piston 567 is in the open position ( FIGS. 9 and 10 ) as compared to the fluid surface area available on the piston 567 surface when the piston 567 is in the closed position ( FIGS. 12 and 13 ). Fluid The available fluid surface area of the piston 567 surface. This difference in the available fluid surface area on the surface of the piston 567 helps to increase the amount of pressure required to bias the piston 567 from the open position to the closed position relative to the pressure required to maintain or maintain the piston 567 in the closed position (i.e., the "maintenance pressure"). position (i.e., "blow-off pressure (blow-off pressure)") required pressure. That is, the blow-off pressure is higher than the maintenance pressure. In a preferred embodiment, the ratio of blow-off pressure to maintenance pressure is 6:1. This is helpful for pressure washers that include an idle mode where the pump speed is reduced when the pump is not in use. Once switched from high pressure operating mode to high flow operating mode, the rapid change in pressure on the face of piston 567 is sufficient to reach blow-off pressure and cause piston 567 to move to the closed position, even for pressure washers that include an idle mode. In a preferred embodiment, the outer diameter of piston 567 is 0.484 inches, the diameter of bypass tube 555 upstream of bypass valve 560 (e.g., the narrowed portion before the shoulder) is 0.187 inches, and the diameter of opening 580 is 0.187 inches. The diameter is 0.073 inches.

As shown in FIGS. 9 and 10 , in the high pressure mode of operation, the force exerted on the upstream face of piston 567 by the second flow of pressurized primary fluid (ie, the flow within bypass conduit 555 ) is applied by spring 575 The force on the piston 567 is overcome, thereby causing the piston 567 to move away from the valve seat 570 to the open position. As shown in Figures 12 and 13, in the high flow mode of operation, the force exerted by the second flow of pressurized primary fluid on the upstream face of the piston 567 is overcome by the force exerted by the spring 575 on the piston 567 such that Piston 567 moves against valve seat 570 to the closed position. In some embodiments, the combined effective flow area of opening 580 and restrictor 515 is less than the effective flow area of the downstream outlet of jet pump 500 in order for bypass valve 560 to close when in the high flow mode of operation (e.g., pressure wash The effective flow area of the nozzle selected by the machine spray gun). In some alternative embodiments, bypass valve 560 is manually operated by user input (eg, via a switch or dial). In these embodiments, a manually operated bypass valve may be used to change between high flow and high pressure operating modes. In some embodiments, the bypass valve may be a two-position (eg, open and closed) valve that includes a user mechanical input for access by a user external to jet pump 500 . In other embodiments, the bypass valve may be electrically actuated (eg, a solenoid valve) to an open or closed position and biased to an opposite position, or electrically actuated to both open and closed positions. The electrically actuated bypass valve can be controlled by user power input (e.g., button, switch, touchpad, touchscreen or other suitable actuators). User power input may communicate with the electrically actuated bypass valve via wire or wirelessly. Thus, for embodiments that include a manually operated bypass valve, a nozzle having a certain effective flow area may be used with a spray gun of a pressure washer operating in a high flow mode of operation or a high pressure mode of operation.

As shown in FIGS. 12 and 13 , in the high flow mode of operation, pressurized primary fluid enters the jet pump 500 via the first fluid inlet 505 . The pressurized primary fluid flows through the primary fluid chamber 535 and into the bypass conduit 555 where the force exerted by the second flow on the upstream face of the piston 567 causes the bypass valve 560 to move to the closed position, thereby closing the bypass valve. Pass line 555 and prevent pressurized primary fluid from flowing through bypass valve 560.

When bypass valve 560 is closed, pressurized primary fluid flows through primary fluid chamber 535 and through primary fluid nozzle 510 . Flow restrictor 515 is in a position where the diameter of the passage through primary fluid nozzle 510 is at its minimum. In some embodiments, the primary fluid nozzle 510 includes a converging portion upstream of the restrictor 515 and a diverging portion downstream of the restrictor 515, where the diameter of the channel narrows in the direction of fluid flow toward the restrictor 515, The diameter of the channel widens in the direction of fluid flow at the diverging portion. In other embodiments, the diverging portion is omitted and the fluid exits the nozzle at the flow restrictor 515 (as shown in FIGS. 9-13 ). In some embodiments, flow restrictor 515 defines an annular bore. Pressurized primary fluid exits primary fluid nozzle 510 into mixing chamber 520 . In some embodiments, the primary fluid nozzle 510 extends into the mixing chamber.

Flow restrictor 515 creates a high velocity jet of pressurized primary fluid exiting primary fluid nozzle 510 to mixing chamber 520 . Restrictor 515 converts pressure to velocity. The high velocity jet of pressurized primary fluid creates a vacuum or low pressure region in the mixing chamber 520 through the Bernoulli or Venturi effect or a combination of both. The vacuum or low pressure region and/or the pressure differential between the low pressure region and the secondary fluid available via secondary fluid inlet 530 is sufficient to introduce the secondary fluid into mixing chamber 520 through secondary fluid inlet 530 . In addition, check valve 557 is opened. Once inside the mixing chamber 520, the secondary fluid is entrained by the pressurized primary fluid to form a combined high volume fluid stream or flow that significantly increases the volume of the flow compared to the pressurized primary fluid itself. The high velocity jet of pressurized primary fluid contacts the secondary fluid introduced into mixing chamber 520, thereby transferring kinetic energy to the secondary fluid. In this manner, the pressurized primary fluid entrains the secondary fluid to form a combined high volume fluid flow or flow. The combined high volume of fluid exits mixing chamber 520 to exit jet pump 500 through fluid outlet 525 .

As shown in FIG. 11 , outlet conduit 540 includes an outlet channel 542 fluidly coupling mixing chamber 520 to fluid outlet 525 . Outlet conduit 540 defines a flared or converging portion 590 at the entrance to outlet channel 542 . The diameter of the bell mouth 590 decreases in the direction of fluid flow. Bell mouth 590 effectively directs the combined high volume fluid flow from mixing chamber 520 into outlet channel 542 . The outlet conduit 540 also defines a diffuser 595 . The diameter of the diffuser 595 increases in the direction of fluid flow. Diffuser 595 converts velocity to pressure, thereby increasing the pressure and decreasing the velocity of the combined high volume fluid stream before it exits jet pump 500 through fluid outlet 525 .

The stepped portion 545 has the smallest diameter of the outlet channel 542 . The diameter of the outlet channel 542 downstream of the step 545 (eg, the diameter of the outlet portion) is greater than the diameter at the step 545 . One or more holes or openings 600 (eg, a plurality of openings arranged around the circumference of outlet passage 542 ) extend from annular chamber 550 to outlet passage 542 . The opening 600 is located downstream of the stepped portion 545 . The increased diameter of outlet passage 542 downstream of step 545 helps minimize turbulence or other disturbances caused by the second flow of pressurized fluid through opening 600 into outlet passage 542 in the high pressure mode of operation. The stepped portion 545 is configured as a venturi suitable for chemical injection, as will be described in more detail below. Additionally, the step 545 creates a Venturi effect in the high flow mode of operation, and the low pressure region downstream of the step is believed to help move the piston 567 to the closed position when transitioning from the high pressure mode of operation to the high flow operation.

Referring to Figure 12, the chemical inlet 565 allows chemicals (eg, soap, polish, spot rinse, herbicide, detergent, etc.) to be added to the combined high volume fluid stream. Chemical inlet 565 is fluidly coupled to a chemical container, source or reservoir. In some embodiments, as shown in FIG. 1 , chemical container 566 is a component of pressure washer 110 and is fluidly coupled to chemical inlet 565 by supply line 568 . In other embodiments, a chemical container is coupled to the spray gun (eg, chemical container 720 of spray guns 700, 740, 750). Chemical inlet 565 is also fluidly coupled to annular chamber 550 via chemical passage 569 formed in valve seat 570 . Check valve 571 selectively closes chemical inlet 565 . When a sufficient pressure differential exists across check valve 571 (eg, between annular chamber 550 and the chemical container), check valve 571 is biased to a closed position and an open position. In some embodiments, chemical inlet 565 is fluidly coupled to bypass conduit 555 downstream of bypass valve 560 . When the back pressure on jet pump 500 is below the chemical threshold pressure, step 545 acts as a venturi and forms a low pressure zone downstream of step 545 . This low pressure zone is sufficient to open the check valve 571 and draw the chemical from the chemical container through the chemical inlet 565 into the annular chamber 550 through the opening 600 into the outlet channel 542 where the chemical is drawn. Added to combined high volume fluid stream. When the back pressure at the injection pump 500 is above the chemical threshold pressure, no low pressure zone is formed and no chemical is drawn from the chemical container. In some embodiments (eg, as shown in FIG. 1 ), an on/off chemical flow control valve 572 is fluidly coupled between the chemical container 566 and the chemical inlet 565 . In some embodiments, a flow restrictor or other metering device is fluidly coupled between the chemical container and the chemical inlet 565 . In some embodiments, one or more additional chemical containers include a different chemical than the first reservoir. A user can select between containers by actuating a selector fluidly coupling one of the containers to an appropriate supply conduit. Additional containers can be coupled to the spray gun or components of the pressure washer. In some embodiments, the chemical threshold pressure is 350 psi. In other embodiments, the chemical threshold pressure is different (eg, 300 psi, 325 psi, 375 psi, etc.). The concentration of the active ingredient in the chemical may need to be optimized for compatibility with high flow modes of operation to achieve the same output concentration of chemical and water as found in conventional chemical injection systems. One advantage of jet pump 500 is that it allows the user to switch between different modes of operation (e.g., high pressure mode of operation, high flow mode of operation without chemicals, high flow mode of operation with chemicals) by varying the back pressure at jet pump 500. Mode) to easily switch between. The back pressure can be changed by changing the effective flow area of the spray gun (changing the position of the rotary nozzle, changing the individual nozzles, adjusting the variable nozzle, changing the spray gun, adjusting the flow restrictor downstream of the injection pump, etc.). The user can switch between different spray patterns and output fluid streams by simply changing the nozzle selected (or adjusting the variable nozzle or changing the spray gun). For example, high-pressure nozzles (e.g., 0° nozzles or 25° flat nozzles) can be selected for high-pressure pressure washing applications, like cleaning sides, while high-flow nozzles (with or without chemical addition) can be selected for high-flow tasks. Like cleaning second floor windows or washing your car. Users are able to use the flow control valve to start and stop fluid flow as needed and change nozzles to select the appropriate mode of operation and chemistry to switch between tasks directly at the gun without having to make changes at the body of the pressure washer. This simplifies the process of switching between tasks and reduces the time required to switch between tasks (eg, pressure washing, rinsing, rinsing, soaping, spot cleaning, etc.).

Referring to Figures 14-16, spray guns 700, 740 and 750 for use with a pressure washer are shown. Each spray gun 700 , 740 and 750 includes a fluid control valve or flow control valve 705 actuated by a trigger 710 (or other user-actuated input device) and a turntable 715 , and a jet pump 500 . The flow control valve 705 allows fluid to exit the spray gun when in the open position and prevents fluid from exiting the spray gun when in the closed position. The turntable 715 includes a plurality of nozzles, each configured to provide a different spray pattern or output fluid flow rate. The user can rotate the turntable 715 to select one of the plurality of nozzles to use. When spray gun 700 is fluidly coupled to an outlet of a pressure washer (eg, fluid outlet 525 ), the effective flow area of the selected nozzle creates backpressure at jet pump 500 . As mentioned above, the back pressure at the jet pump 500 controls whether the jet pump 500 is in the high flow mode of operation or the high pressure mode of operation, and controls whether chemical species are added or not added in the high flow mode of operation.

For example, in some embodiments, the turret 715 includes a first nozzle 716, a second nozzle 717, and a third nozzle 718, the first nozzle 716 having a first effective flow area that creates a relatively high back pressure at the jet pump 500, Thus enabling a high pressure mode of operation, the second nozzle 717 has a second effective flow area greater than the first effective flow area creating a relatively lower backpressure at the injection pump 500 above the chemical threshold pressure, enabling a high flow mode of operation , and does not allow chemicals to be added to the combined high volume fluid flow, the third nozzle 718 has a third nozzle 718 larger than the second effective flow area that creates a relatively low back pressure below the chemical threshold pressure at the jet pump at 500 Effective flow area, enabling high flow modes of operation and adding chemicals to the combined high volume fluid stream. The turntable 715 allows the user to switch between different spray patterns and output fluid flow rates by simply changing the nozzle selected. For example, high-pressure nozzles (e.g., 0° nozzles or 25° flat nozzles) can be selected for high-pressure pressure washing applications, like cleaning sides, while high-flow nozzles (with or without chemical addition) can be selected for high-flow tasks. Like cleaning second floor windows or washing your car. The user is able to switch between tasks directly at the spray gun 700 using the flow control valve 705 to start and stop fluid flow as desired and the rotary table 715 to select the appropriate mode of operation and chemistry.

In some embodiments, turret 715 is replaced by a fluid outlet with a fitting capable of receiving one detachable nozzle at a time (eg, similar to spray gun 118 and nozzles 265 and 270 described above). By simply changing the nozzle selected, as with the turntable 715, multiple detachable nozzles can be used to switch between different spray patterns and output fluid flow rates, where each detachable nozzle has a different effective flow rate area.

Chemical container 720 is secured to the body of spray gun 700 and is fluidly coupled to spray pump 500 at chemical inlet 565 . In some embodiments, the chemical container 720 is removably secured to the body of the spray gun 700 so that the chemical container can be removed and refilled or replaced as desired.

As shown in FIGS. 15 and 16 , jet pump 500 may be located upstream of flow control valve 705 . Flow control valve 705 is designed to handle the fluid output associated with the high pressure and high flow modes of operation. As shown in FIG. 15 , jet pump 500 is detachably attached to the body of spray gun 740 . As shown in FIG. 16 , jet pump 500 may be integrated into spray gun 750 .

As shown in FIG. 14 , jet pump 500 is integrated into spray gun 700 downstream of flow control valve 705 such that flow control valve 705 controls the flow of pressurized primary fluid to jet pump 500 fluid inlet 505 . The flow control valve 705 is designed to handle the maximum fluid output of the pressure washer. In these embodiments, the spray gun 700 also includes a pressure relief valve 721 or other shutoff valve to prevent secondary fluid from exiting the spray gun even when the flow control valve 705 is closed. The pressure relief valve 721 is configured to open at a threshold pressure (eg, 100 psi) above typical water supply pressure (eg, 30 psi) and to close at a pressure below the threshold pressure to prevent continuous flow of secondary fluid from the spray gun 700 .

14-16, the primary fluid inlet 505 of the jet pump 500 is fluidly coupled to the outlet of the pressure washer (e.g., fluid outlet 525) through a high pressure hose or conduit 725, and the secondary fluid inlet 530 is fluidly coupled through a low pressure hose or conduit 730. (eg, a garden hose) is fluidly coupled to a water source (eg, to a municipal water supply or a casing to a well). In some alternative embodiments where jet pump 500 is used with a garden hose booster system (for example, U.S. Application No. 12/411,139 filed March 25, 2009 and published as US2010/0243086 The booster water sprinkler system described in, the garden hose booster water pump system described in U.S. Application No. 12/502,798, filed July 14, 2009 and issued as US 8,439,651, and the garden hose booster water pump system described in 2010 Application No. 12/787,282, filed May 25 and published as US2011/0290827, all of which are hereby incorporated by reference in their entirety), the primary fluid inlet 505 of jet pump 500 passes the low pressure A hose or pipe (e.g., a garden hose) is fluidly coupled to the outlet of the garden hose booster system, and the secondary fluid inlet 530 is fluidly coupled to a water source (e.g., connected to casings for municipal water systems or wells). Hoses 725 and 730 may be attached to each other (eg, by clamps, straps, ties, etc., or co-molded, co-extruded, or otherwise formed as a single hose with two flow channels or paths). The water source supplies secondary fluid to jet pump 500 and primary fluid to a water pump (eg, water pump 116 ) of the pressure washer. For example, a tee fitting can be provided at the inlet to the water pump so that water from the water source can be provided to the water pump and the secondary fluid inlet 530 . In some embodiments, the spray gun 700 also includes a second or low pressure trigger that actuates a second on/off flow control valve to fluidly connect the secondary fluid hose to the fluid output (e.g., on turntable 715). nozzle of choice) to provide secondary fluid flow for low-pressure and low-flow tasks (e.g., "garden hose" flow).

17-18, a spray gun 760 is shown. The spray gun 760 includes an adjustable or variable nozzle 719 for varying the effective flow area of the spray gun rather than multiple nozzles as shown in FIGS. 14-16. As shown in Figure 17, in the first configuration of the variable nozzle 719, the effective flow area is relatively large and a high flow mode of operation is achieved. As shown in FIG. 18, in the second configuration of the variable nozzle 719, the effective flow area is relatively small and a high pressure mode of operation is achieved. In some embodiments, variable nozzle 719 is infinitely variable. In some embodiments, the variable nozzle 719 has a plurality of preset positions corresponding to different effective flow areas.

Jet pump 500 may also be integrated with water pump 116 as shown in FIGS. 9-13 and 19 . Primary fluid inlet 505 is fixed to pump outlet 130 . For example, as shown in FIG. 19, a threaded coupling 800 is threaded into the pump outlet 130, and a clamping fastener 805 (eg, a self-tapping clamping bolt) provides a radial clamping load. As shown in FIG. 9 , an O-ring or gasket 810 seals the connection between the fluid inlet 505 and the pump outlet 130 . Tee fitting 815 includes primary fluid conduit 820 secured to pump inlet 128 and secondary fluid conduit 825 secured to secondary fluid inlet 530 . For example, primary fluid conduit 820 is secured to pump inlet 128 by threaded coupling 800 , clamping fastener 805 , and O-ring 810 similar to those used to secure primary fluid inlet 505 to pump outlet 130 . For example, as shown in FIG. 19 , secondary fluid conduit 825 is secured to secondary fluid inlet 530 by flanged fitting 830 and fasteners 835 (eg, self-tapping screws). As shown in FIG. 9 , an O-ring or gasket 840 seals the connection between the secondary fluid conduit 825 and the secondary fluid inlet 530 . Tee fitting 815 also includes an inlet 816 configured to connect to a fluid source. In some embodiments, inlet 816 includes a garden hose or other low pressure connection.

In some embodiments, a common or common pump housing houses the pump mechanisms of jet pump 500 and water pump 116 . In some embodiments, the pump housing includes mounting structure for attaching the water pump 116 to the prime mover. In some embodiments, jet pump 500 and at least a portion of the water pump 116 pumping mechanism (eg, cylinder or piston body, housing, crankcase, etc.) are formed as a single (eg, unitary, monolithic) component (eg, a single casting). A flow multiplier (such as jet pump 500) that is "integral" or "integrated" with a water pump (such as water pump 116) is a single integral component, where the flow multiplier and water pump share the same enclosed flow multiplier and water pump pump The common housing of the pumping mechanism and/or at least a part of the pumping mechanism in which the flow multiplier and the water pump (eg, cylinder or piston body, housing, crankcase, etc.) are formed as a single (eg, integrated, monolithic) Components (eg, formed as a single casting, formed as a single molded part, etc.).

Referring to FIG. 20 , an electric pressure washer 900 is shown in accordance with an exemplary embodiment. Jet pump 500 is integrated with water pump 116 to form flow multiplier and water pump assembly 905 . In the illustrated embodiment, the flow multiplier and water pump assembly are internal components of the electric pressure washer 900 that are located entirely within the housing 910 of the electric pressure washer 900 and are therefore relatively invisible to the user during normal operation of the pressure washer 900. is not visible. In some embodiments, the flow multiplier and pump assembly 905 can be an external component of the electric pressure washer 900 (e.g., located entirely outside or outside of the housing 910 so that it is invisible to the user during normal operation of the pressure washer 900). visible). In other embodiments, at least a portion (e.g., at least a portion of one or more of primary fluid inlet 505, fluid outlet 525, secondary fluid inlet 530, and chemical inlet 565) extends through housing 910 and is visible to the user during normal operation of the machine. The electric pressure washer 900 also includes an electric motor 915 as a prime mover and a power cord 920 for supplying electrical power to the electric motor 915 . An actuator (e.g., a switch, button, touchpad, touchscreen, or other suitable user input device) can be actuated by a user to activate or deactivate the electric motor 915 and thereby activate or deactivate the flow multiplier and water pump assembly 905 . In some embodiments, the flow multiplier and water pump assembly 905 is an internal component of the air pressure washer (eg, located within the housing or shroud of the air pressure washer). Flow multiplier and water pump assembly 905 may be considered a single water pump that includes jet pump 500 and the main pumping mechanism (eg, water pump 116 ). This single water pump can be used in place of other types of pumps (eg, variable displacement pumps, variable stroke pumps, variable speed pumps, etc.) capable of providing varying flow rates.

As shown in FIG. 21 , in some embodiments, jet pump 500 may be an external component of pressure washer 1000 such that the jet pump is visible to the user during normal operation of the pressure washer. The flow multiplier may be part of pressure washer 1000 sold by the manufacturer. Jet pump 500 may also be installed on pressure washer 1000 later by the user. In this manner, a user can convert an existing pressure washer to one capable of high flow and high pressure operating modes and chemical injection. Accordingly, jet pump 500 may be attached to and detached from pressure washer 1000 .

In some embodiments, jet pump 500 is integrated into an output conduit or hose that fluidly couples the pump outlet (eg, pump outlet 130 ) to the spray gun.

When spray pump 500 is not secured to the spray gun (eg, pressure washers 900 and 1000 ), a single output hose or pipe with a single fluid passage or path may be used to fluidly couple fluid outlet 525 to the spray gun. Preferably, the output hose is designed to handle both high pressure and high flow modes of operation (eg, the high pressure hose provides sufficient flow for high flow modes of operation).

The jet pump 500 is sold separately from the pressure washer to allow the user to convert an existing pressure washer to one capable of high flow and high pressure operating modes and chemical injection. Jet pump 500 may be sold individually or as part of a kit that includes jet pump 500, a spray gun such as spray gun 700, and a device for fluidly coupling jet pump 500 to the spray gun or a pressure washer to jet pump 500. any hose or tubing required. A user can use this kit to couple the secondary fluid inlet 530 of the jet pump 500 by coupling the primary fluid inlet 505 of the jet pump 500 to the pump outlet 130 of the water pump 116 (e.g., via pipe or hose, direct coupling, etc.) A standard or conventional pressure washer can be converted to a supply pipe or hose configured to be coupled to a fluid source, and to couple the fluid outlet 525 to an output pipe or hose or to a spray gun (such as spray guns 740 and 760). Variable flow pressure washer. A user may also couple jet pump 500 to the body of the pressure washer (e.g., to water pump 116, to frame 112, to base plate 122, to prime mover 114, etc.), or to a spray gun (e.g., spray gun 740 and 760). A tee fitting 815 may be included in the kit such that a common fluid source is coupled to the secondary fluid inlet 530 and the pump inlet 128 of the water pump 116 .

Jet pump 500 is suitable for use with pneumatic pressure washers (i.e., pressure washers having an internal combustion engine as the prime mover) and with electric pressure washers (i.e., pressure washers having an electric motor as the prime mover). use. Pneumatic pressure washers typically have a higher output rating (eg, in terms of pressure and/or flow rate that can be provided) than electric pressure washers. Jet pump 500 allows the pressure washer to provide a high flow mode of operation not otherwise obtainable from a standard or conventional pressure washer alone. At the bare minimum, a pressure washer is rated at 100psi. Pressure washers can be rated up to 4000 psi and above. For example, for an air powered pressure washer rated at 3000 psi at 2.7 gpm, jet pump 500 may provide a high flow mode of operation producing 400 psi at 5 gpm. For an electric pressure washer rated at 1700 psi at 1.3 gpm, the jet pump 500 offers a high flow mode of operation producing 175 psi at 4.7 gpm. Jet pump 500 approximately doubles the flow rate of pneumatic pressure washers and approximately triples the flow rate of electric pressure washers.

Referring to FIG. 3A , in some embodiments, a pressure washer may include a water source pressure gauge 1205 . A water source pressure gauge 1205 is fluidly coupled to the secondary fluid source to indicate whether there is sufficient secondary fluid pressure at the secondary fluid inlet 230 to provide sufficient secondary fluid to successfully achieve the high flow mode of operation. When the secondary fluid pressure is too low (eg, below a threshold), then the secondary fluid source cannot provide enough secondary fluid to maintain the demands of the flow multiplier 200 in the high flow mode of operation. This occurs, for example, when using a well with low line pressure as a secondary fluid source. The water source pressure gauge 1205 provides an indication to the user (eg, light, message, audible sound or other user perceivable indicator) that the secondary fluid pressure is sufficient to allow for the high flow mode of operation.

In some embodiments, a pressure washer includes a frame, a prime mover supported by the frame and including a power take-off, a water pump coupled to the power take-off and including a pump inlet and a pump outlet, fluidly coupled to the pump inlet and configured to couple to the primary A supply conduit of a fluid supply, a flow multiplier comprising a mixing chamber with a fluid outlet, a primary fluid inlet fluidly coupled to the pump outlet, a primary fluid inlet downstream of the primary fluid inlet, a primary fluid nozzle downstream of the primary fluid restrictor , extending into the mixing chamber and having a primary fluid nozzle located at a nozzle outlet in the mixing chamber, and a secondary fluid inlet in fluid communication with the mixing chamber, a secondary fluid conduit fluidly coupled to the supply conduit and the secondary fluid inlet, along a check valve along the secondary fluid conduit and upstream of the secondary fluid inlet, the check valve configured to close the secondary fluid conduit in response to a mixing chamber pressure above a threshold pressure, a delivery conduit fluidly connected to the fluid outlet, and a fluid A spray gun coupled to a delivery conduit downstream of the fluid outlet, the spray gun comprising at least two nozzles, a first nozzle with a first flow area and a second nozzle with a second flow area greater than the first flow area, through which the fluid passes through the at least two nozzles One of them leaves the spray gun. In high pressure mode of operation, primary fluid flows from the primary fluid source through the supply line to the pump, where it is pressurized, leaves the pump, enters the flow multiplier through the primary fluid inlet, passes through the primary restrictor to the primary fluid nozzle, exits the primary The fluid nozzle exits into the mixing chamber, exits the mixing chamber through the fluid outlet, passes through the delivery conduit to the spray gun, and exits the spray gun through the first nozzle such that the mixing chamber pressure exceeds the threshold pressure. In high flow mode of operation, primary fluid flows from the primary fluid source through the supply line to the pump, is pressurized in the pump, leaves the pump, enters the flow multiplier through the primary fluid inlet, passes through the primary restrictor to the primary fluid nozzle, and exits the primary fluid nozzle outlet into the mixing chamber, and the secondary fluid flows out of the supply line, through the check valve, and into the mixing chamber through the secondary fluid inlet such that the secondary fluid is entrained by the primary fluid, causing it to exit the mixing chamber through the fluid outlet The combined fluid flow of the chambers travels through the delivery conduit to the spray gun and exits the spray gun through the second nozzle, thereby maintaining the mixing chamber pressure below a threshold pressure.

The construction and arrangement of the devices, systems and methods as shown in the various exemplary embodiments are exemplary only. Although only a few embodiments have been described in detail in this disclosure, many modifications (e.g., changes in: size, dimension, structure, shape and proportions of various elements, parameter values, mounting arrangements, use of materials , color, orientation, etc.) are possible. For example, some elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this disclosure. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. Other substitutions, modifications, changes and omissions may also be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present disclosure.

The present disclosure contemplates methods, systems, and program products on any machine-readable medium for performing various operations. Embodiments of the present disclosure may be implemented using an existing computer processor, or by a special purpose computer processor incorporated for this or other purpose suitable for an appropriate system, or by a hardwired system. Embodiments within the scope of the present disclosure may include program products comprising machine-readable media for carrying or having machine-executable instructions or data structures stored thereon. Such machine-readable media can be any available media that can be accessed by a general purpose or special purpose computer or other machine with a processor. By way of example, such machine-readable media may include RAM, ROM, EPROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage device, or any other medium that may be used to carry or store What is required is program code of machine-executable instructions or data structures and which can be accessed by a general purpose or special purpose computer or other machine with a processor. When information is transmitted or provided over a network or another communications link (hardwired, wireless, or a combination of hardwired or wireless) connected to the machine, the machine properly considers that connection to be a machine-readable medium. Thus, any such connection is properly termed a machine-readable medium. Combinations of the above are also included within the scope of machine-readable media. Machine-executable instructions include, for example, instructions and data which cause a general purpose computer, special purpose computer, or special purpose processing machine to perform a particular function or group of functions.

Although the figures may show a particular order of method steps, the order of the steps may differ from the order of the steps shown. Furthermore, two or more steps may be performed simultaneously or partially simultaneously. This variation will depend on various factors, including the software and hardware system chosen and on designer choice. All such modifications are within the scope of this disclosure. Similarly, software implementations of the present invention may be implemented using standard programming techniques with rules based logic and other logic to perform the various connection steps, processing steps, comparison steps and decision steps.

Claims (93)

1. a pressure washer, it comprises:

Prime mover;

Be connected to the water pump of prime mover, water pump comprises for receiving the pump intake of fluid from fluid source, and the pump discharge of secondary working fluid for supplied with pressurized;

Jet pump, it comprises the primary fluid inlet that fluid is connected to pump discharge, is configured to the secondary fluid entrance being connected to fluid source, and fluid issuing; And

Spray gun, it is configured to the fluid issuing that fluid is connected to jet pump, and spray gun comprises the lance outlet with variable valid circulation area;

Wherein, in operation, first valid circulation area of lance outlet produces the first back pressure at jet pump place, thus realizes operation with high pressure pattern, and the Primary fluid flow pressurizeed under this operation with high pressure pattern flows out by jet pump and by the fluid issuing of jet pump; And

Wherein, in operation, second valid circulation area being greater than the first valid circulation area of lance outlet produces the second back pressure being less than the first back pressure at jet pump place, realize high throughput pattern thus, the Primary fluid flow pressurizeed under this high throughput pattern is by jet pump and carry the secondary fluid of being supplied by secondary fluid entrance from fluid source secretly, make secondary fluid also flow through jet pump, result through the fluid stream of the secondary working fluid of jet pump fluid issuing outflow and the merging of secondary fluid.

2. pressure washer according to claim 1, wherein, described spray gun comprises the multiple nozzles for changing valid circulation area, and wherein each nozzle has different valid circulation area, and a nozzle wherein once can only be selected to provide export from the fluid of spray gun.

3. pressure washer according to claim 2, wherein, multiple nozzle is formed in turntable.

4. pressure washer according to claim 1, wherein, described spray gun also comprises the adjustable nozzle for changing valid circulation area, and wherein said adjustable nozzle is removable to change valid circulation area.

5. pressure washer according to claim 1, wherein, described jet pump also comprises:

Mixing chamber, its fluid between nozzle and fluid issuing connects and fluid is connected to secondary fluid entrance;

Have the nozzle of current limiter, wherein said fluid nozzle is connected between primary fluid inlet and fluid issuing, makes pressurization secondary working fluid flow through current limiter before entering mixing chamber;

By-pass line, its fluid is connected to pump discharge and mixing chamber, to provide the bypass flow path walking around nozzle; And

By-passing valve, it to be arranged in by-pass line and to be configured to move between open and closed positions, optionally to open and close by-pass line;

Wherein said pass valve configuration becomes to move between open and closed positions in response to the back pressure at jet pump place;

Wherein under first back pressure at described jet pump place, during by-passing valve is in an open position; And

Wherein under second back pressure at described jet pump place, during by-passing valve is in the closed position.

6. pressure washer according to claim 1, also comprises:

For the chemicals source of supplying chemical product;

Wherein said jet pump also comprises:

At the fluid upstream of fluid issuing and fluid is connected to the mixing chamber of secondary fluid entrance;

Have the nozzle of current limiter, wherein said fluid nozzle is connected between primary fluid inlet and fluid issuing, makes pressurization secondary working fluid flow through current limiter before entering mixing chamber;

Exit passageway between mixing chamber and fluid issuing, described exit passageway comprises end difference, wherein the diameter of exit passageway is at end difference everywhere in minimum diameter, and the exit portion in end difference downstream is everywhere in the exit portion diameter being greater than described minimum diameter; And

Chemical inlet, its fluid is connected to the described exit passageway in end difference downstream, optionally chemicals to be provided to the fluid stream leaving jet pump fluid issuing from described chemicals source; And

Wherein said end difference is configured to Venturi tube, make under the first pressure of the fluid flowed by Venturi tube, chemicals from chemicals source adds the fluid stream left before jet pump fluid issuing to, and under the second pressure being greater than the first pressure, the chemicals from chemicals source does not add the fluid stream left before jet pump fluid issuing to.

7. pressure washer according to claim 6, wherein, described chemicals source is fixed to spray gun.

8. pressure washer according to claim 6, wherein, described chemical inlet leads in the by-pass line in by-passing valve downstream.

9. pressure washer according to claim 6, wherein, in operation, under first back pressure at jet pump place, the secondary working fluid of pressurization by Venturi tube, makes the chemicals from chemicals source not add the secondary working fluid stream of pressurization at the second flow under pressure.

10. pressure washer according to claim 6, wherein, in operation, under second back pressure at jet pump place, the fluid of merging flows through Venturi tube at a first pressure, makes the chemicals from chemicals source add the fluid stream of merging to.

11. pressure washers according to claim 1, wherein, described jet pump is attached to water pump.

12. pressure washers according to claim 1, wherein, described jet pump is incorporated in spray gun.

13. pressure washers according to claim 12, wherein, described spray gun comprises flow control valve, in the open position described flow control valve allow fluid leave spray gun and in a closed position anti-fluid leave described spray gun; And

Wherein said jet pump is positioned at the upstream of flow control valve.

14. pressure washers according to claim 13, also comprise:

Pump discharge fluid is connected to the pressure piping of primary fluid inlet.

15. pressure washers according to claim 12, wherein, described spray gun comprises flow control valve, in the open position described flow control valve allow fluid leave spray gun and in a closed position anti-fluid leave described spray gun; And

Wherein said jet pump is positioned at the downstream of flow control valve.

16. pressure washers according to claim 15, also comprise:

Pump discharge fluid is connected to the pressure piping of primary fluid inlet.

17. 1 kinds of electric press cleaning machines, it comprises:

Electro-motor;

For supplying power to the power line of electro-motor;

Be connected to the water pump of electro-motor, water pump comprises for receiving the pump intake of fluid from fluid source, and the pump discharge of secondary working fluid for supplied with pressurized;

Jet pump, it comprises the primary fluid inlet that fluid is connected to pump discharge, is configured to the secondary fluid entrance being connected to fluid source, and fluid issuing; And

Spray gun, it is configured to the fluid issuing that fluid is connected to jet pump, and spray gun comprises the lance outlet with variable valid circulation area;

Wherein, in operation, first valid circulation area of lance outlet produces the first back pressure at jet pump place, thus realizes operation with high pressure pattern, and the Primary fluid flow pressurizeed under this operation with high pressure pattern flows out by jet pump and by the fluid issuing of jet pump; And

Wherein, in operation, second valid circulation area being greater than the first valid circulation area of lance outlet produces the second back pressure being less than the first back pressure at jet pump place, realize high throughput pattern thus, the Primary fluid flow pressurizeed under this high throughput pattern is by jet pump and carry the secondary fluid of being supplied by secondary fluid entrance from fluid source secretly, make secondary fluid also flow through jet pump, result through the fluid stream of the secondary working fluid of jet pump fluid issuing outflow and the merging of secondary fluid.

18. electric press cleaning machines according to claim 17, wherein, described spray gun also comprises the multiple nozzles for changing valid circulation area, and wherein each nozzle has different valid circulation area, and a nozzle wherein once can only be selected to provide export from the fluid of spray gun.

19. electric press cleaning machines according to claim 18, wherein, multiple nozzle is formed in turntable.

20. electric press cleaning machines according to claim 17, wherein, described spray gun also comprises the adjustable nozzle for changing valid circulation area, and wherein said adjustable nozzle is removable to change valid circulation area.

21. pressure washers according to claim 17, wherein, described jet pump also comprises:

Mixing chamber, its fluid between nozzle and fluid issuing connects and fluid is connected to secondary fluid entrance;

Have the nozzle of current limiter, wherein said fluid nozzle is connected between primary fluid inlet and fluid issuing, makes pressurization secondary working fluid flow through current limiter before entering mixing chamber;

By-pass line, its fluid is connected to pump discharge and mixing chamber, to provide the bypass flow path walking around nozzle; And

By-passing valve, it to be arranged in by-pass line and to be configured to move between open and closed positions, optionally to open and close by-pass line;

Wherein said pass valve configuration becomes to move between open and closed positions in response to the back pressure at jet pump place;

Wherein under first back pressure at described jet pump place, during by-passing valve is in an open position; And

Wherein under second back pressure at described jet pump place, during by-passing valve is in the closed position.

22. electric press cleaning machines according to claim 17, also comprise:

For the chemicals source of supplying chemical product;

Wherein said jet pump also comprises:

At the fluid upstream of fluid issuing and fluid is connected to the mixing chamber of secondary fluid entrance;

Have the nozzle of current limiter, wherein said fluid nozzle is connected between primary fluid inlet and fluid issuing, makes the secondary working fluid pressurizeed flow through current limiter before entering mixing chamber;

Exit passageway between mixing chamber and fluid issuing, described exit passageway comprises end difference, wherein the diameter of exit passageway is at end difference everywhere in minimum diameter, and the exit portion in end difference downstream is everywhere in the exit portion diameter being greater than described minimum diameter; And

Chemical inlet, its fluid is connected to the described exit passageway in end difference downstream, optionally chemicals to be provided to the fluid stream leaving jet pump fluid issuing from described chemicals source; And

Wherein said end difference is configured to Venturi tube, make under the first pressure of the fluid flowed by Venturi tube, chemicals from chemicals source adds the fluid stream left before jet pump fluid issuing to, and under the second pressure being greater than the first pressure, the chemicals from chemicals source does not add the fluid stream left before jet pump fluid issuing to.

23. electric press cleaning machines according to claim 17, wherein, described jet pump is attached to water pump.

24. electric press cleaning machines according to claim 17, wherein, described jet pump is incorporated in spray gun.

25. electric press cleaning machines according to claim 24, wherein, described spray gun comprises flow control valve, in the open position described flow control valve allow fluid leave spray gun and in a closed position anti-fluid leave described spray gun; And

Wherein said jet pump is positioned at the upstream of flow control valve.

26. electric press cleaning machines according to claim 24, wherein, described spray gun comprises flow control valve, in the open position described flow control valve allow fluid leave spray gun and in a closed position anti-fluid leave described spray gun; And

Wherein said jet pump is positioned at the downstream of flow control valve.

27. 1 kinds of pressure washers, it comprises:

Prime mover;

Be connected to the water pump of prime mover, water pump comprises for receiving the pump intake of fluid from fluid source, and the pump discharge of secondary working fluid for supplied with pressurized;

Jet pump, it comprises:

Fluid is connected to the primary fluid inlet of pump discharge;

Be configured to the secondary fluid entrance being connected to fluid source, and fluid issuing;

At the fluid upstream of fluid issuing and fluid is connected to the mixing chamber of secondary fluid entrance;

Have the nozzle of current limiter, wherein said fluid nozzle is connected between primary fluid inlet and fluid issuing, makes the secondary working fluid pressurizeed flow through current limiter before entering mixing chamber;

By-pass line, its fluid is connected to pump discharge and described mixing chamber, to provide the bypass flow path walking around nozzle; And

By-passing valve, it to be arranged in by-pass line and to be configured to move between open and closed positions, optionally to open and close by-pass line; And

Spray gun, it is configured to the fluid issuing that fluid is connected to jet pump, and spray gun comprises the lance outlet with variable valid circulation area;

Wherein, in operation, first valid circulation area of lance outlet produces the first back pressure at jet pump place, thus realizes operation with high pressure pattern, and the Primary fluid flow pressurizeed under this operation with high pressure pattern flows out by jet pump and by the fluid issuing of jet pump;

Wherein, in operation, second valid circulation area being greater than the first valid circulation area of lance outlet produces the second back pressure being less than the first back pressure at jet pump place, realize high throughput pattern thus, the Primary fluid flow pressurizeed under this high throughput pattern is by jet pump and carry the secondary fluid of being supplied by secondary fluid entrance from fluid source secretly, make secondary fluid also flow through jet pump, result through the fluid stream of the secondary working fluid of jet pump fluid issuing outflow and the merging of secondary fluid;

Wherein, under operation with high pressure pattern, during described by-passing valve is in an open position and the Primary fluid flow of pressurization arrive the fluid issuing of jet pump by nozzle and bypass flow path; And

Wherein, under the operator scheme of high flow capacity, during by-passing valve is in the closed position.

28. pressure washers according to claim 27, wherein, the current limiter of described nozzle limits looping pit.

29. pressure washers according to claim 27, wherein, described by-passing valve comprises:

Valve seat;

Can the piston of movement between open and closed positions, wherein described piston does not engage with valve seat in the open position, thus allow the fluid of pressurization to flow through described by-passing valve, wherein described piston engages with valve seat in a closed position, thus prevents the fluid pressurizeed from flowing through described by-passing valve; And

Piston is biased to the spring of open position.

30. pressure washers according to claim 29, wherein, described piston comprises:

Chamber, its be sized to when piston in the closed position middle time receive valve seat; And

Lead to the opening of chamber, wherein when piston in an open position middle time pressurization fluid flow through opening arrive chamber.

31. 1 kinds of water pumps, it comprises:

For the pumping mechanism of the secondary working fluid stream that pressurizes, pumping mechanism comprises for receiving the pump intake of fluid from fluid source, and the pump discharge of secondary working fluid for supplied with pressurized; And

Jet pump, it comprises the primary fluid inlet that fluid is connected to pump discharge, is configured to the secondary fluid entrance being connected to fluid source, and fluid issuing; And

Wherein, in operation, under first back pressure at jet pump place, realize operation with high pressure pattern, the Primary fluid flow pressurizeed under this operation with high pressure pattern flows out by jet pump and by the fluid issuing of jet pump; And

Wherein, in operation, under the second back pressure that jet pump place is less than the first back pressure, realize high throughput pattern, the Primary fluid flow pressurizeed under this high throughput pattern is by jet pump and carry the secondary fluid of being supplied by secondary fluid entrance from fluid source secretly, make secondary fluid also flow through jet pump, result through the fluid stream of the secondary working fluid of jet pump fluid issuing outflow and the merging of secondary fluid.

32. water pumps according to claim 31, also comprise:

Encapsulate the pump case of described pumping mechanism and jet pump.

33. water pumps according to claim 32, wherein, described pump case comprises the mounting structure for water pump being attached to prime mover.

34. water pumps according to claim 31, wherein, described jet pump and pumping mechanism be formed as single parts at least partially.

35. water pumps according to claim 31, wherein, described single parts are castings.

36. water pumps according to claim 31, wherein, described pumping mechanism can produce the secondary working fluid of the pressurization of at least 500psi.

37. water pumps according to claim 31, wherein, described pumping mechanism can produce the secondary working fluid of the pressurization of at least 1000psi.

38. water pumps according to claim 31, wherein, described jet pump also comprises:

At the fluid upstream of fluid issuing and fluid is connected to the mixing chamber of secondary fluid entrance;

Have the nozzle of current limiter, wherein said fluid nozzle is connected between primary fluid inlet and fluid issuing, makes the secondary working fluid pressurizeed flow through current limiter before entering mixing chamber;

By-pass line, its fluid is connected to pump discharge and described mixing chamber, to provide the bypass flow path walking around nozzle; And

By-passing valve, it to be arranged in by-pass line and to be configured to move between open and closed positions, optionally to open and close by-pass line;

Wherein said pass valve configuration becomes to move between open and closed positions in response to the back pressure at jet pump place;

Wherein under first back pressure at described jet pump place, during by-passing valve is in an open position; And

Wherein under second back pressure at described jet pump place, during by-passing valve is in the closed position.

39. according to water pump according to claim 38, and wherein, described jet pump also comprises:

Exit passageway between mixing chamber and fluid issuing, described exit passageway comprises end difference, wherein the diameter of exit passageway is at end difference everywhere in minimum diameter, and the exit portion in end difference downstream is everywhere in the exit portion diameter being greater than described minimum diameter; And

Chemical inlet, its fluid is connected to the described exit passageway in end difference downstream, optionally chemicals to be provided to the fluid stream leaving jet pump fluid issuing from described chemicals source; And

Wherein said end difference is configured to Venturi tube, make under fluid first pressure flowed by Venturi tube, chemicals from chemicals source adds the fluid stream left before jet pump fluid issuing to, and under the second pressure being greater than the first pressure, the chemicals from chemicals source does not add the fluid stream left before jet pump fluid issuing to.

40. water pumps according to claim 31, wherein, described jet pump also comprises:

At the fluid upstream of fluid issuing and fluid is connected to the mixing chamber of secondary fluid entrance;

Have the nozzle of current limiter, wherein said fluid nozzle is connected between primary fluid inlet and fluid issuing, makes the secondary working fluid pressurizeed flow through current limiter before entering mixing chamber;

Exit passageway between mixing chamber and fluid issuing, described exit passageway comprises end difference, wherein the diameter of exit passageway is at end difference everywhere in minimum diameter, and the exit portion in end difference downstream is everywhere in the exit portion diameter being greater than described minimum diameter; And

Chemical inlet, its fluid is connected to the described exit passageway in end difference downstream, optionally chemicals to be provided to the fluid stream leaving jet pump fluid issuing from described chemicals source; And

Wherein said end difference is configured to Venturi tube, make under fluid first pressure flowed by Venturi tube, chemicals from chemicals source adds the fluid stream left before jet pump fluid issuing to, and under the second pressure being greater than the first pressure, the chemicals from chemicals source does not add the fluid stream left before jet pump fluid issuing to.

41. water pumps according to claim 40, wherein, described chemical inlet leads in the by-pass line in by-passing valve downstream.

42. water pumps according to claim 40, wherein, in operation, under first back pressure at jet pump place, the secondary working fluid of pressurization by Venturi tube, makes the chemicals from chemicals source not add the secondary working fluid stream of pressurization at the second flow under pressure.

43. water pumps according to claim 40, wherein, in operation, under second back pressure at jet pump place, the fluid of merging flows through Venturi tube at a first pressure, makes the chemicals from chemicals source add the fluid stream of merging to.

44. water pumps according to claim 31, wherein, described jet pump also comprises:

At the fluid upstream of fluid issuing and fluid is connected to the mixing chamber of secondary fluid entrance;

Have the nozzle of current limiter, wherein said fluid nozzle is connected between primary fluid inlet and fluid issuing, makes the secondary working fluid pressurizeed flow through current limiter before entering mixing chamber;

By-pass line, its fluid is connected to pump discharge and described mixing chamber, to provide the bypass flow path walking around nozzle; And

By-passing valve, it to be arranged in by-pass line and to be configured to move between open and closed positions, optionally to open and close by-pass line; And

Wherein under operation with high pressure pattern, during described by-passing valve is in an open position, and pressurization Primary fluid flow arrives the fluid issuing of jet pump by nozzle and bypass flow path; And

Wherein under high throughput pattern, during by-passing valve is in the closed position, and the Primary fluid flow of pressurization passes through nozzle, make the pressurization secondary working fluid leaving nozzle arrival mixing chamber carry the secondary fluid being fed to mixing chamber by secondary fluid entrance secretly, cause the fluid stream flowing through the secondary working fluid of jet pump fluid issuing and the merging of secondary fluid.

45. water pumps according to claim 44, wherein, the current limiter of described nozzle limits looping pit.

46. water pumps according to claim 44, wherein, described by-passing valve comprises:

Valve seat;

Can the piston of movement between open and closed positions, wherein described piston does not engage with valve seat in the open position, thus allow the fluid of pressurization to flow through described by-passing valve, wherein described piston engages with valve seat in a closed position, thus prevents the fluid pressurizeed from flowing through described by-passing valve; And

Piston is biased to the spring of open position.

47. water pumps according to claim 46, wherein, described piston comprises:

Chamber, its be sized to when piston in the closed position middle time receive valve seat; And

Lead to the opening of chamber, wherein when piston in an open position middle time pressurization fluid flow through opening arrive chamber.

48. 1 kinds of jet pumps, it comprises;

Be configured to the primary fluid inlet that fluid is connected to the primary fluid source of pressurization;

Be configured to the secondary fluid entrance being fluidly connected to secondary flow body source;

Fluid issuing;

At the fluid upstream of fluid issuing and fluid is connected to the mixing chamber of secondary fluid entrance;

Have the nozzle of current limiter, wherein said nozzle fluid between primary fluid inlet and fluid issuing connects, to make the secondary working fluid pressurizeed flow through current limiter before entering mixing chamber;

By-pass line, its fluid is connected to mixing chamber to provide the bypass flow path walking around described nozzle; And

By-passing valve, it to be arranged in by-pass line and to be configured to move between open and closed positions, optionally to open and close by-pass line;

Wherein said pass valve configuration becomes to move between described open position and described closed position in response to the back pressure at jet pump place;

Wherein, under first back pressure at jet pump place, during by-passing valve is in an open position; And

Be less than the second back pressure of described first back pressure at jet pump place under, by-passing valve is in cut out.

49. jet pumps according to claim 48, also comprise:

Exit passageway between mixing chamber and fluid issuing, described exit passageway comprises end difference, wherein the diameter of exit passageway is at end difference everywhere in minimum diameter, and the exit portion in end difference downstream is everywhere in the exit portion diameter being greater than described minimum diameter; And

Chemical inlet, its fluid is connected to the described exit passageway in end difference downstream, optionally chemicals to be provided to the fluid stream leaving jet pump fluid issuing from described chemicals source; And

Wherein said end difference is configured to Venturi tube, make under fluid first pressure flowed by Venturi tube, chemicals from chemicals source adds the fluid stream left before jet pump fluid issuing to, and under the second pressure being greater than the first pressure, the chemicals from chemicals source does not add the fluid stream left before jet pump fluid issuing to.

50. jet pumps according to claim 49, wherein, described chemical inlet leads in the by-pass line in by-passing valve downstream.

51. jet pumps according to claim 49, wherein, in operation, under first back pressure at jet pump place, the secondary working fluid of pressurization by Venturi tube, makes the chemicals from chemicals source not add the secondary working fluid stream of pressurization at the second flow under pressure.

52. jet pumps according to claim 49, wherein, in operation, under second back pressure at jet pump place, the fluid of merging flows through Venturi tube at a first pressure, makes the chemicals from chemicals source add the fluid stream of merging to.

53. jet pumps according to claim 48, wherein, the current limiter of described nozzle limits looping pit.

54. jet pumps according to claim 48, wherein, described by-passing valve comprises:

Valve seat;

Can the piston of movement between open and closed positions, wherein described piston does not engage with valve seat in the open position, thus allow the fluid of pressurization to flow through described by-passing valve, wherein described piston engages with valve seat in a closed position, thus prevents the fluid pressurizeed from flowing through described by-passing valve; And

Piston is biased to the spring of open position.

55. jet pumps according to claim 54, wherein, described piston comprises:

Chamber, its be sized to when piston in the closed position middle time receive valve seat; And

Lead to the opening of chamber, wherein when piston in an open position middle time pressurization fluid flow through opening arrive chamber.

56. 1 kinds of jet pump kit utilitys for using together with water pump, it comprises:

Jet pump, described jet pump comprises and is configured to fluid and is connected to the pump discharge of water pump to receive the primary fluid inlet of secondary working fluid of pressurization, is configured to fluid and is connected to secondary flow body source to receive the secondary fluid entrance of secondary fluid, and fluid issuing; And

Spray gun, described spray gun comprises the lance outlet with variable valid circulation area.

57. jet pump kit utilitys according to claim 56, also comprise:

The fluid issuing of jet pump is connected to the pressure piping of spray gun.

58. jet pump kit utilitys according to claim 56, wherein, described spray gun also comprises the multiple nozzles for changing valid circulation area, and wherein each nozzle has different valid circulation area, and a nozzle wherein once can only be selected to provide export from the fluid of spray gun.

59. jet pump kit utilitys according to claim 56, wherein, multiple nozzle is formed in turntable.

60. jet pump kit utilitys according to claim 56, wherein, described spray gun also comprises the adjustable nozzle for changing valid circulation area, and wherein said adjustable nozzle is removable to change valid circulation area.

61. jet pump kit utilitys according to claim 56, wherein, described jet pump and spray gun are independent parts.

62. jet pump kit utilitys according to claim 45, wherein, described jet pump is incorporated in spray gun.

63. jet pump kit utilitys according to claim 62, wherein, described spray gun comprises flow control valve, in the open position described flow control valve allow fluid leave spray gun and in a closed position anti-fluid leave described spray gun; And

Wherein said jet pump is in the upstream of flow control valve.

64. jet pump kit utilitys according to claim 63, also comprise:

For primary fluid inlet fluid being connected to the pressure piping of pump discharge; And

For secondary fluid inlet fluid being connected to the high flow capacity pipeline of secondary fluid supply department.

65. jet pump kit utilitys according to claim 64, wherein, described pressure piping and high flow capacity pipeline are attached to one another.

66. jet pump kit utilitys according to claim 62, wherein, described spray gun also comprises flow control valve, in the open position described flow control valve allow fluid leave spray gun and in a closed position anti-fluid leave described spray gun; And

Wherein said jet pump is positioned at the downstream of flow control valve.

67. jet pump kit utilitys according to claim 66, also comprise:

For primary fluid inlet fluid being connected to the pressure piping of pump discharge; And

For secondary fluid inlet fluid being connected to the high flow capacity pipeline of secondary fluid supply department.

68. jet pump kit utilitys according to claim 67, wherein, described pressure piping and high flow capacity pipeline are attached to one another.

69. jet pump kit utilitys according to claim 66, wherein, described spray gun also comprises check-valves, with convenient flow control valve in the closed position middle time prevent secondary fluid from the flowing of jet pump.

70. 1 kinds of jet pump kit utilitys for using together with water pump, it comprises:

Jet pump, described jet pump comprises and is configured to the pump discharge that fluid is connected to water pump, to receive the primary fluid inlet of the secondary working fluid of pressurization, is configured to fluid and is connected to secondary flow body source to receive the secondary fluid entrance of secondary fluid, and fluid issuing;

First spray gun, described first spray gun comprises the lance outlet with the first valid circulation area; And

Second spray gun, described second spray gun comprises the lance outlet with the second valid circulation area being greater than the first valid circulation area.

71. jet pump kit utilitys according to claim 70, also comprise:

For the fluid issuing of jet pump being connected to the pressure piping of spray gun.

72. 1 kinds of spray guns, it comprises:

There is the lance outlet of variable valid circulation area;

Flow control valve, its allow in the open position fluid leave spray gun and in a closed position anti-fluid leave described spray gun; And

Jet pump, it comprises and is configured to the pump discharge that fluid is connected to water pump, to receive the primary fluid inlet of the secondary working fluid of pressurization, is configured to fluid and is connected to secondary fluid supply department to receive the secondary fluid entrance of secondary fluid, and fluid issuing.

73., according to the spray gun described in claim 72, also comprise:

For changing multiple nozzles of valid circulation area, wherein each nozzle has different valid circulation area, and a nozzle wherein once can only be selected to provide export from the fluid of spray gun.

74. according to the spray gun described in claim 73, and wherein, multiple nozzle is formed in turntable.

75., according to the spray gun described in claim 72, also comprise:

For changing the adjustable nozzle of valid circulation area, wherein said adjustable nozzle is removable to change valid circulation area.

76. according to the spray gun described in claim 72, and wherein, the fluid issuing of described jet pump is positioned at the upstream of flow control valve.

77. according to the spray gun described in claim 72, and wherein, the fluid issuing of described jet pump is positioned at the downstream of flow control valve.

78. according to the spray gun described in claim 77, wherein, also comprises:

Check-valves, when flow control valve in the closed position middle time prevent secondary fluid from flowing out from spray gun.

79. 1 kinds of pressure washers, it comprises:

Prime mover;

Be connected to the water pump of prime mover, water pump comprises for receiving the pump intake of fluid from fluid source, and the pump discharge of secondary working fluid for supplied with pressurized;

Jet pump, it comprises the primary fluid inlet that fluid is connected to pump discharge, is configured to the secondary fluid entrance being connected to fluid source, and fluid issuing;

First spray gun, it is configured to the fluid issuing that fluid is connected to jet pump, and the first spray gun has the first valid circulation area; And

Second spray gun, it is configured to the fluid issuing that fluid is connected to jet pump, and the second spray gun has the second valid circulation area being greater than the first valid circulation area;

Wherein, in operation, when the first spray gun fluid is connected to fluid issuing, first valid circulation area produces the first back pressure at jet pump place, thus realizing operation with high pressure pattern, the Primary fluid flow pressurizeed under this operation with high pressure pattern flows out by jet pump and by the fluid issuing of jet pump; And

Wherein, in operation, when the second spray gun fluid is connected to fluid issuing, the second larger valid circulation area of lance outlet produces the second back pressure of the first back pressure be less than at jet pump place, realize high throughput pattern thus, the Primary fluid flow pressurizeed under this high throughput pattern is by jet pump and carry the secondary fluid of being supplied by secondary fluid entrance from fluid source secretly, make secondary fluid also flow through jet pump, result through the fluid stream of the secondary working fluid of jet pump fluid issuing outflow and the merging of secondary fluid.

80. according to the pressure washer described in claim 79, and wherein, described jet pump also comprises:

At the fluid upstream of fluid issuing and fluid is connected to the mixing chamber of secondary fluid entrance;

Have the nozzle of current limiter, wherein said fluid nozzle is connected between primary fluid inlet and fluid issuing, makes the secondary working fluid pressurizeed flow through current limiter before entering mixing chamber;

By-pass line, its fluid is connected to pump discharge and described mixing chamber, to provide the bypass flow path walking around nozzle; And

By-passing valve, it to be arranged in by-pass line and to be configured to move between open and closed positions, optionally to open and close by-pass line; And

Wherein said pass valve configuration becomes to move between described open position and described closed position in response to the back pressure at jet pump place;

Wherein, under first back pressure at jet pump place, during by-passing valve is in an open position; And

Under second back pressure at jet pump place, during by-passing valve is in the closed position.

81., according to the pressure washer described in claim 79, also comprise:

For the chemicals source of supplying chemical product;

Wherein said jet pump also comprises:

In the upstream of fluid issuing and fluid is connected to the mixing chamber of secondary fluid entrance;

Have the nozzle of current limiter, wherein said fluid nozzle is connected between primary fluid inlet and fluid issuing, makes pressurization secondary working fluid flow through current limiter before entering mixing chamber;

Exit passageway between mixing chamber and fluid issuing, described exit passageway comprises end difference, wherein the diameter of exit passageway is at end difference everywhere in minimum diameter, and the exit portion in end difference downstream is everywhere in the exit portion diameter being greater than described minimum diameter; And

Chemical inlet, its fluid is connected to the described exit passageway in end difference downstream, optionally chemicals to be provided to the fluid stream leaving jet pump fluid issuing from described chemicals source; And

Wherein said end difference is configured to Venturi tube, make under fluid first pressure flowed by Venturi tube, chemicals from chemicals source adds the fluid stream left before jet pump fluid issuing to, and under the second pressure being greater than the first pressure, the chemicals from chemicals source does not add the fluid stream left before jet pump fluid issuing to.

82. pressure washers according to Claim 8 described in 1, wherein, described chemicals source is fixed to spray gun.

83. pressure washers according to Claim 8 described in 1, wherein, described chemical inlet leads in the by-pass line in by-passing valve downstream.

84. pressure washers according to Claim 8 described in 1, wherein, in operation, under first back pressure at jet pump place, the secondary working fluid of pressurization by Venturi tube, makes the chemicals from chemicals source not add the secondary working fluid stream of pressurization at the second flow under pressure.

85. pressure washers according to Claim 8 described in 1, wherein, in operation, under second back pressure at jet pump place, the fluid of merging flows through Venturi tube at a first pressure, makes the chemicals from chemicals source add the fluid stream of merging to.

86. according to the pressure washer described in claim 79, and wherein, described jet pump is attached to water pump.

87. pressure washers according to claim 1, wherein, described jet pump is incorporated in the first spray gun and the second jet pump is incorporated in the second spray gun.

88. 1 kinds change the method for flowing in response to back pressure, and described method comprises:

Pressure fluid is supplied to jet pump;

The first back pressure is formed at jet pump place;

Realize operation with high pressure pattern in response to the first back pressure, the fluid pressurizeed under this operation with high pressure pattern flows through jet pump;

Form the second back pressure at jet pump place, wherein said second back pressure is less than the first back pressure; And

Realize high throughput pattern in response to described second back pressure, the fluid pressurizeed under this high throughput pattern flows through jet pump and carries secondary fluid secretly, to cause the fluid stream of the merging of flowing out jet pump.

89. methods according to Claim 8 described in 8, characterized by further comprising:

Fluid source fluid is connected to jet pump, wherein from fluid source drawing pressurized fluid and secondary fluid.

90. methods according to Claim 8 described in 8, also comprise:

Form the 3rd back pressure at jet pump place, wherein said 3rd back pressure is less than described second back pressure;

High flow capacity and chemicals implant operation pattern is realized in response to described 3rd back pressure, the fluid pressurizeed under this high flow capacity and chemicals implant operation pattern flows through jet pump and carries secondary fluid secretly, cause the fluid stream of the merging of flowing out jet pump, and chemicals to be added to the fluid stream of merging in response to Venturi effect.

91. methods according to Claim 8 described in 8, also comprise:

Under operation with high pressure pattern, described pressure fluid is flowed by main flow path and the bypass flow path by jet pump; And

Under high volume operator scheme, pressure fluid is caused only to flow through main flow path.

92., according to the method described in claim 91, also comprise:

Under high throughput pattern, close bypass flow path in response to the second back pressure by by-passing valve.

93. methods according to Claim 8 described in 8, wherein, the fluid stream of merging has higher flow compared with pressure fluid and lower pressure.